Digital single
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In music, a single is a type of
release Release may refer to: * Art release, the public distribution of an artistic production, such as a film, album, or song * Legal release, a legal instrument * News release, a communication directed at the news media * Release (ISUP), a code to iden ...
, typically a song recording of fewer tracks than an
LP record The LP (from "long playing" or "long play") is an analog sound storage medium, a phonograph record format characterized by: a speed of   rpm; a 12- or 10-inch (30- or 25-cm) diameter; use of the "microgroove" groove specification; an ...
or an album. One can be released for sale to the public in a variety of formats. In most cases, a single is a song that is released separately from an album, although it usually also appears on an album. In other cases a recording released as a single may not appear on an album. Despite being referred to as a single, in the era of
music download A music download (commonly referred to as a digital download) is the digital transfer of music via the Internet into a device capable of decoding and playing it, such as a personal computer, portable media player, MP3 player or smartphone. Th ...
s, singles can include up to as many as three tracks. The biggest digital music distributor, the
iTunes Store The iTunes Store is a digital media store operated by Apple Inc. It opened on April 28, 2003, as a result of Steve Jobs' push to open a digital marketplace for music. As of April 2020, iTunes offered 60 million songs, 2.2 million apps, 25,00 ...
, accepts as many as three tracks that are less than ten minutes each as a single. Any more than three tracks on a musical release or thirty minutes in total running time is an
extended play An extended play record, usually referred to as an EP, is a musical recording that contains more tracks than a single but fewer than an album or LP record.
(EP) or, if over six tracks long, an album. Historically, when mainstream music was purchased via vinyl records, singles would be released double-sided, i.e. there was an A-side and a B-side, on which two songs would appear, one on each side.


Early history

The origins of the single are in the late 19th century, when music was distributed on
phonograph cylinder Phonograph cylinders are the earliest commercial medium for recording and reproducing sound. Commonly known simply as "records" in their era of greatest popularity (c. 1896–1916), these hollow cylindrical objects have an audio recording engra ...
s that held two to four minutes' worth of audio. They were superseded by disc
phonograph record A phonograph record (also known as a gramophone record, especially in British English), or simply a record, is an analog sound storage medium in the form of a flat disc with an inscribed, modulated spiral groove. The groove usually starts near ...
s, which initially also had a short duration of playing time per side. In the first two to three decades of the 20th century, almost all commercial music releases were, in effect, singles (the exceptions were usually for classical music pieces, where multiple physical storage media items were bundled together and sold as an album). Phonograph records were manufactured with a range of playback speeds (from 16 to 78 rpm) and in several sizes (including ). By about 1910, however, the , 78-rpm
shellac Shellac () is a resin secreted by the female lac bug on trees in the forests of India and Thailand. It is processed and sold as dry flakes and dissolved in alcohol to make liquid shellac, which is used as a brush-on colorant, food glaze and ...
disc had become the most commonly used format. The inherent technical limitations of the gramophone disc defined the standard format for commercial recordings in the early 20th century. The relatively crude disc-cutting techniques of the time and the thickness of the needles used on
record players A phonograph, in its later forms also called a gramophone (as a trademark since 1887, as a generic name in the UK since 1910) or since the 1940s called a record player, or more recently a turntable, is a device for the mechanical and analogu ...
limited the number of grooves per inch that could be inscribed on the disc surface and a high rotation speed was necessary to achieve acceptable recording and playback fidelity. 78 rpm was chosen as the standard because of the introduction of the electrically powered synchronous turntable motor in 1925, which ran at 3,600 rpm with a 46:1 gear ratio, resulting in a rotation speed of 78.3 rpm. With these factors applied to the 10-inch format, songwriters and performers increasingly tailored their output to fit the new medium. The three-minute single remained the standard into the 1960s, when the availability of microgroove recording and improved mastering techniques enabled recording artists to increase the duration of their recorded songs. The breakthrough came with
Bob Dylan Bob Dylan (legally Robert Dylan, born Robert Allen Zimmerman, May 24, 1941) is an American singer-songwriter. Often regarded as one of the greatest songwriters of all time, Dylan has been a major figure in popular culture during a career sp ...
's "
Like a Rolling Stone "Like a Rolling Stone" is a song by American singer-songwriter Bob Dylan, released on July 20, 1965, by Columbia Records. Its confrontational lyrics originated in an extended piece of verse Dylan wrote in June 1965, when he returned exhausted fro ...
": although
Columbia Records Columbia Records is an American record label owned by Sony Music Entertainment, a subsidiary of Sony Corporation of America, the North American division of Japanese conglomerate Sony. It was founded on January 15, 1889, evolving from the A ...
tried to make the record more "radio-friendly" by cutting the performance into halves and separating them between the two sides of the disc, both Dylan and his fans demanded that the full six-minute take be placed on one side and that radio stations play the song in its entirety.


Types of physical singles

Singles have been issued in various formats, including , 10-inch and
12-inch The twelve-inch single (often written as 12-inch or 12″) is a type of vinyl ( polyvinyl chloride or PVC) gramophone record that has wider groove spacing and shorter playing time with a 'single' or a few related sound tracks on each surfac ...
discs, usually playing at 45 rpm; 10-inch shellac discs, playing at 78 rpm;
maxi single A maxi single or maxi-single (sometimes abbreviated to MCD or CDM) is a music single release with more than the usual two tracks of an A-side song and a B-side song. The first maxi singles Mungo Jerry's first single, " In the Summertime" was t ...
s; 7-inch plastic flexi discs; cassettes; and CD singles. Other, less common, formats include singles on Digital Compact Cassette, DVD and
Laserdisc The LaserDisc (LD) is a home video format and the first commercial optical disc storage medium, initially licensed, sold and marketed as MCA DiscoVision (also known simply as "DiscoVision") in the United States in 1978. Its diameter typical ...
, as well as many non-standard sizes of vinyl disc (, , etc.). Up until mid-1970s, British single releases were packaged in generic paper sleeves. Limited editions containing picture sleeves sold well around that period, so the number of UK singles packaged in picture sleeves increased thereafter. In 1992, cassette and CD singles surpassed 7-inch vinyls.


7-inch format

The most common form of the vinyl single is the "45" or "7-inch". The names are derived from its play speed, 45 rpm (revolutions per minute), and the standard diameter, 7 inches. The 7-inch 45 rpm record was released March 31, 1949, by
RCA Victor RCA Records is an American record label currently owned by Sony Music Entertainment, a subsidiary of Sony Corporation of America. It is one of Sony Music's four flagship labels, alongside RCA's former long-time rival Columbia Records; also A ...
as a smaller, more durable and higher- fidelity replacement for the
78 rpm A phonograph record (also known as a gramophone record, especially in British English), or simply a record, is an analog sound storage medium in the form of a flat disc with an inscribed, modulated spiral groove. The groove usually starts near ...
shellac discs. The first 45 rpm records were monaural, with recordings on both sides of the disc. As stereo recordings became popular in the 1960s, almost all 45 rpm records were produced in stereo by the early 1970s.
Columbia Records Columbia Records is an American record label owned by Sony Music Entertainment, a subsidiary of Sony Corporation of America, the North American division of Japanese conglomerate Sony. It was founded on January 15, 1889, evolving from the A ...
, which had released the  rpm 12-inch vinyl LP in June 1948, also released  rpm 7-inch vinyl singles in March 1949, but they were soon eclipsed by the RCA Victor 45. The first regular production 45 rpm record pressed was "PeeWee the Piccolo": RCA Victor 47-0146 pressed December 7, 1948 at the Sherman Avenue plant in
Indianapolis Indianapolis (), colloquially known as Indy, is the state capital and most populous city of the U.S. state of Indiana and the seat of Marion County. According to the U.S. Census Bureau, the consolidated population of Indianapolis and Marion ...
; R.O. Price, plant manager. The claim made that 48-0001 by Eddy Arnold was the first 45 is evidently incorrect (even though 48-0000 has not turned up, 50-0000-Crudup, 51-0000-Meisel, and 52-0000 Goodman are out there) since all 45s were released simultaneously with the 45 player in March 1949. There was plenty of information leaked to the public about the new 45 rpm system through front-page articles in ''
Billboard A billboard (also called a hoarding in the UK and many other parts of the world) is a large outdoor advertising structure (a billing board), typically found in high-traffic areas such as alongside busy roads. Billboards present large adverti ...
'' magazine on December 4, 1948, and again on January 8, 1949. RCA was trying to blunt the lead Columbia had established upon releasing their   LP system in June 1948. To compete with Columbia, RCA released albums as boxes of 45 rpm 7-inch singles that could be played continuously like an LP on their record changer. RCA was also releasing 7-inch singles pressed in different colors for different genres, making it easy for customers to find their preferred music. The novelty of multicolored singles wore off soon: by 1952 all RCA singles were pressed in black vinyl. The lightweight and inexpensive 45 rpm discs introduced by RCA were quickly popular and in the early 1950s all major US labels had begun manufacturing 7-inch singles. In some regions (e.g. US), the default hole size fitted the original RCA 1.5 inch hub which, due to a
format war A format war is a competition between similar but mutually incompatible technical standards that compete for the same market, such as for data storage devices and recording formats for electronic media. It is often characterized by political ...
, was incompatible with the 0.25-inch spindle of a Columbia-system 33 1/3 RPM 12-inch LP player. In other regions (e.g. UK), the default was a small hole compatible with a multi-speed 0.25-inch spindle player, but with a "knock out" that was removed for usage on a larger hub player. One could play a large-hole record on a player with a 0.25-inch spindle by inserting a single puck or by using a spindle adapter.


12-inch format

Although 7 inches remained the standard size for vinyl singles,
12-inch single The twelve-inch single (often written as 12-inch or 12″) is a type of vinyl ( polyvinyl chloride or PVC) gramophone record that has wider groove spacing and shorter playing time with a 'single' or a few related sound tracks on each surfac ...
s were introduced for use by DJs in
discos Disco is a genre of dance music and a subculture that emerged in the 1970s from the United States' urban nightlife scene. Its sound is typified by four-on-the-floor beats, syncopated basslines, string sections, brass and horns, electric piano ...
in the 1970s. The longer playing time of these singles allowed the inclusion of extended dance mixes of tracks. In addition, the larger surface area of the 12-inch discs allowed for wider grooves (larger amplitude) and greater separation between grooves, the latter of which results in less cross-talk. Consequently, they are less susceptible to wear and scratches. The 12-inch single is still considered a standard format for
dance music Dance music is music composed specifically to facilitate or accompany dancing. It can be either a whole musical piece or part of a larger musical arrangement. In terms of performance, the major categories are live dance music and recorded da ...
, though its popularity has declined in recent years.


Digital era

As digital downloading and audio streaming have become more prevalent, it has become possible for every track on an album to also be available separately. Nevertheless, the concept of a single from an album has been retained as an identification of the more heavily promoted or more popular songs on an album. The demand for music downloads skyrocketed after the launch of
Apple An apple is an edible fruit produced by an apple tree (''Malus domestica''). Apple trees are cultivated worldwide and are the most widely grown species in the genus '' Malus''. The tree originated in Central Asia, where its wild ancest ...
's
iTunes Store The iTunes Store is a digital media store operated by Apple Inc. It opened on April 28, 2003, as a result of Steve Jobs' push to open a digital marketplace for music. As of April 2020, iTunes offered 60 million songs, 2.2 million apps, 25,00 ...
(then called
iTunes Music Store The iTunes Store is a digital media store operated by Apple Inc. It opened on April 28, 2003, as a result of Steve Jobs' push to open a digital marketplace for music. As of April 2020, iTunes offered 60 million songs, 2.2 million apps, 25,000 ...
) in January 2001 and the creation of portable music and digital audio players such as the
iPod The iPod is a discontinued series of portable media players and multi-purpose mobile devices designed and marketed by Apple Inc. The first version was released on October 23, 2001, about months after the Macintosh version of iTunes wa ...
. In September 1997, with the release of
Duran Duran Duran Duran () are an English rock band formed in Birmingham in 1978 by singer and bassist Stephen Duffy, keyboardist Nick Rhodes and guitarist/bassist John Taylor. With the addition of drummer Roger Taylor the following year the band we ...
's "
Electric Barbarella "Electric Barbarella" is the 29th single by Duran Duran, and the first official single from the album ''Medazzaland''. In 1997, the single and album were released only in the United States; "Electric Barbarella" was not issued as a single in th ...
" for paid downloads,
Capitol Records Capitol Records, LLC (known legally as Capitol Records, Inc. until 2007) is an American record label distributed by Universal Music Group through its Capitol Music Group imprint. It was founded as the first West Coast-based record label of not ...
became the first
major label A record label, or record company, is a brand or trademark of music recordings and music videos, or the company that owns it. Sometimes, a record label is also a publishing company that manages such brands and trademarks, coordinates the prod ...
to sell a digital single from a well-known artist. Previously,
Geffen Records Geffen Records is an American record label established by David Geffen and owned by Universal Music Group through its Interscope Geffen A&M Records imprint. Founded in 1980, Geffen Records has been a part of Interscope Geffen A&M since 1999 and h ...
also released
Aerosmith Aerosmith is an American rock band formed in Boston in 1970. The group consists of Steven Tyler (lead vocals), Joe Perry (guitar), Tom Hamilton (bass), Joey Kramer (drums) and Brad Whitford (guitar). Their style, which is rooted in blues ...
's "
Head First Head First or Headfirst may refer to: Music * ''Head First'' (The Babys album) (1979) * ''Head First'' (Badfinger album) (recorded 1974, released 2000) * ''Head First'' (Goldfrapp album) (2010), or its title track * ''Head First'' (Uriah Hee ...
" digitally for free. In 2004, the
Recording Industry Association of America The Recording Industry Association of America (RIAA) is a trade organization that represents the music recording industry in the United States. Its members consist of record labels and distributors that the RIAA says "create, manufacture, and/ ...
(RIAA) introduced digital single certification due to significant sales of digital formats, with
Gwen Stefani Gwen Renée Stefani (; born October 3, 1969) is an American singer, songwriter, fashion designer and actress. She is a co-founder, lead vocalist, and the primary songwriter of the band No Doubt, whose singles include " Just a Girl", " Spiderweb ...
's " Hollaback Girl" becoming RIAA's first platinum digital single. In 2013, RIAA incorporated on-demand streams into the digital single certification. Single sales in the United Kingdom reached an all-time low in January 2005, as the popularity of the compact disc was overtaken by the then-unofficial medium of the music download. Recognizing this, on 17 April 2005, Official UK Singles Chart added the download format to the existing format of physical CD singles. Gnarls Barkley was the first act to reach No.1 on this chart through downloads alone in April 2006, for their debut single "
Crazy Insanity, madness, lunacy, and craziness are behaviors performed by certain abnormal mental or behavioral patterns. Insanity can be manifest as violations of societal norms, including a person or persons becoming a danger to themselves or to ...
", which was released physically the following week. On 1 January 2007, digital downloads (including unbundled album tracks) became eligible from the point of release, without the need for an accompanying physical. Sales gradually improved in the following years, reaching a record high in 2008 that still proceeded to be overtaken in 2009, 2010 and 2011. In the late 2010s, artists began a trend of releasing multiple singles before eventually releasing a studio album. An unnamed A&R representative confirmed to ''
Rolling Stone ''Rolling Stone'' is an American monthly magazine that focuses on music, politics, and popular culture. It was founded in San Francisco, California, in 1967 by Jann Wenner, and the music critic Ralph J. Gleason. It was first known for its ...
'' in 2018 that "an artist has to build a foundation to sustain" and added that "When artists have one big record and go run with that, it doesn't work because they never had a foundation to begin with." The same article cited examples such as
Cardi B Belcalis Marlenis Almánzar Cephus (, ; born October 11, 1992), known professionally as Cardi B, is an American rapper and songwriter. She first gained popularity as an influencer on Vine (service), Vine and Instagram. From 2015 to early 2017, ...
,
Camila Cabello Karla Camila Cabello Estrabao (; ; born March 3, 1997) is a Cuban-born American singer and songwriter. She rose to prominence as a member of the girl group Fifth Harmony, which became one of the best-selling girl groups of all time. While in ...
and
Jason Derulo Jason Joel Desrouleaux (born September 21, 1989), known professionally as Jason Derulo (; formerly stylized as Derülo), is an American singer and songwriter.
releasing four or more singles prior to their album releases.


Culture

The sales of singles are recorded in
record chart A record chart, in the music industry, also called a music chart, is a ranking of recorded music according to certain criteria during a given period. Many different criteria are used in worldwide charts, often in combination. These include ...
s in most countries in a
Top 40 In the music industry, the Top 40 is the current, 40 most-popular songs in a particular genre. It is the best-selling or most frequently broadcast popular music. Record charts have traditionally consisted of a total of 40 songs. "Top 40" or "cont ...
format. The charts are often published in magazines and numerous television shows and
radio Radio is the technology of signaling and communicating using radio waves. Radio waves are electromagnetic waves of frequency between 30  hertz (Hz) and 300  gigahertz (GHz). They are generated by an electronic device called a tr ...
programs count down the list. To be eligible for inclusion in charts, the single must meet the requirement set by the charting company that governs the playing time of the single. In
popular music Popular music is music with wide appeal that is typically distributed to large audiences through the music industry. These forms and styles can be enjoyed and performed by people with little or no musical training.Popular Music. (2015). ''Fu ...
, the commercial and artistic importance of the single (as compared to the EP or album) has varied over time, technological development, and according to the audience of particular artists and genres. Singles have generally been more important to artists who sell to the youngest purchasers of music (younger teenagers and pre-teens), who tend to have more limited financial resources. Starting in the mid-1960s, albums became a greater focus and became more important as artists created albums of uniformly high-quality and coherent themes, a trend that reached its apex in the development of the
concept album A concept album is an album whose tracks hold a larger purpose or meaning collectively than they do individually. This is typically achieved through a single central narrative or theme, which can be instrumental, compositional, or lyrical. Some ...
. Over the 1990s and the early 2000s, the single generally received less and less attention in the United States as albums, which on compact disc had virtually identical production and distribution costs but could be sold at a higher price, became most retailers' primary method of selling music. Singles continued to be produced in the UK and Australia and survived the transition from compact disc to digital download. The decline of the physical single in the US during this time has been cited as a major marketing mistake on the part of record companies, as it eliminated an inexpensive recording format for young fans to become accustomed to purchasing music. In its place was the predominance of the album, which alienated customers by the expense of purchasing a longer format for only one or two songs of interest. That in turn encouraged interest in
file sharing File sharing is the practice of distributing or providing access to digital media, such as computer programs, multimedia (audio, images and video), documents or electronic books. Common methods of storage, transmission and dispersion include r ...
software on the internet like
Napster Napster was a peer-to-peer file sharing application. It originally launched on June 1, 1999, with an emphasis on digital audio file distribution. Audio songs shared on the service were typically encoded in the MP3 format. It was founded by Sha ...
for single recordings, which began to undercut the music recording market.
Dance music Dance music is music composed specifically to facilitate or accompany dancing. It can be either a whole musical piece or part of a larger musical arrangement. In terms of performance, the major categories are live dance music and recorded da ...
, however, has followed a different commercial pattern and the single, especially the 12-inch vinyl single, remains a major method by which dance music is distributed. Another development of the 2000s was the popularity of mobile phone
ringtone A ringtone, ring tone or ring is the sound made by a telephone to indicate an incoming call. Originally referring to and made by the electromechanical striking of bells, the term now refers to any sound on any device alerting of a new incoming ...
s based on pop singles. In September 2007,
Sony BMG Sony BMG Music Entertainment was an American record company owned as a 50–50 joint venture between Sony Corporation of America and Bertelsmann. The venture's successor, the revived Sony Music, is wholly owned by Sony, following their buyou ...
announced that it would introduce a new type of CD single, called "ringles", for the 2007 holiday season. The format included three songs by an artist, plus a ringtone accessible from the user's computer. Sony announced plans to release 50 singles in October and November, and
Universal Music Group Universal Music Group N.V. (often abbreviated as UMG and referred to as just Universal Music) is a Dutch–American multinational music corporation under Dutch law. UMG's corporate headquarters are located in Hilversum, Netherlands and its ...
expected to release somewhere between 10 and 20 titles. In a reversal of this trend, a single has been released based on a ringtone itself: the Crazy Frog ringtone, which was a cult hit in Europe in 2004, was released as a
mashup Mashup may refer to: * Mashup (culture), the rearrangement of spliced parts of musical pieces as part of a subculture * Mashup (education), combining various forms of data and media by a teacher or student in an instructional setting * Mashup (m ...
with "
Axel F "Axel F" is the electronic instrumental theme from the 1984 film ''Beverly Hills Cop'' performed by Harold Faltermeyer. It was an international number one hit in 1985. Background The title comes from the main character's name in the film, A ...
" in June 2005 amid a massive publicity campaign and subsequently hit No. 1 on the UK chart. The term ''single'' is sometimes regarded as a misnomer since one record usually contains two songs: the
A-side and B-side The A-side and B-side are the two sides of phonograph records and cassettes; these terms have often been printed on the labels of two-sided music recordings. The A-side usually features a recording that its artist, producer, or record compan ...
. In 1982, CBS marketed one-sided singles at a lower price than two-sided singles.


In South Korea

In South Korean music, the terminology for "albums" and "singles" is unique and includes an additional term, the single album (). In contemporary usage in English, the term "album" refers to an LP-length recording regardless of the medium, but in contrast, the Korean usage of "album" () denotes a musical recording of any length released specifically on physical media. Although the terms "single albums" and "singles" are similar and sometimes may overlap, depending on the context, they are considered two distinct release types in South Korea. A "single album" refers to a physical release (like CD, LP or some other media) collecting one or more singles, while a "single" is only a song itself, typically a digital stream or download. The
Gaon Album Chart The Circle Album Chart, previously known as the Gaon Album Chart, is a record chart ranking the 100 most popular albums, extended play An extended play record, usually referred to as an EP, is a musical recording that contains more tracks t ...
tracks sales of all "offline" albums released as physical media and so single albums compete alongside full-length studio albums (LPs) and mini-albums (EPs). The
Gaon Digital Chart The Circle Digital Chart, previously known as the Gaon Digital Chart, is the music industry standard record chart ranking the 200 most popular singles in South Korea. It provides rankings on a weekly, monthly, and yearly basis, which is based o ...
, which tracks downloads and streams, is regarded as the official "singles" chart. As a distinct release type, the single album developed during the CD era in the 1990s. Single albums, typically including about two or three songs, were marketed as a more affordable alternative to a full-length CD album. The term "single album" is sometimes used to refer to a release that would simply be called a "single" in Western contexts, such as a 7-inch 45rpm record released before the advent of downloadable music. To give an example of the differences between full-length albums, single albums and singles, the K-pop boy band
Big Bang The Big Bang event is a physical theory that describes how the universe expanded from an initial state of high density and temperature. Various cosmological models of the Big Bang explain the evolution of the observable universe from the ...
has a full-length studio album, titled ''
MADE Made or MADE may refer to: Entertainment Film * ''Made'' (1972 film), United Kingdom * ''Made'' (2001 film), United States Music * ''Made'' (Big Bang album), 2016 * ''Made'' (Hawk Nelson album), 2013 * ''Made'' (Scarface album), 2007 *''M.A.D.E.' ...
'', which was originally released as a series of four single albums: '' M'', '' A'', '' D'' and '' E''. Two singles were included on each of those single albums; the first in the series, ''M'', contains the singles " Loser" and "
Bae Bae "Bae Bae" is a song recorded by South Korean boy band Big Bang. It was released as a digital single on May 1, 2015 through YG Entertainment, serving as one of the eight lead singles from the band's third Korean-language studio album ''Made'' (20 ...
". A single album is distinct from a single even if it includes only one song. The single " Gotta Go" by
Chungha Kim Chung-ha (, born Kim Chan-mi []; February 9, 1996), known mononym, mononymously as Chungha (stylized as CHUNG HA), is a South Korean Pop music, pop singer, dancer and choreographer signed under MNH Entertainment. She finished fourth in Mn ...
was released on a single album titled ''XII'', which was a one-track CD. Even though "Gotta Go" was the only song on ''XII'', the two releases carry different titles and charted separately: ''XII'' reached No.4 on the Gaon Album Chart, and "Gotta Go" reached No.2 on the Gaon Digital Chart.


See also

*
Gramophone record A phonograph record (also known as a gramophone record, especially in British English), or simply a record, is an analog sound storage medium in the form of a flat disc with an inscribed, modulated spiral groove. The groove usually starts ne ...
*
Lead single A lead single (also known as a debut single) is the first single to be released from a studio album by an artist or a band, usually before the album itself is released and also occasionally on the same day of the album's release date. Release s ...
*
List of best-selling singles This is a compendium of the best-selling music singles. The criterion for inclusion is to sell at least ten million copies worldwide. The singles listed here were cited by reliable sources from various media, such as digital journalism, news ...


References


Further reading

* * * * Carson, B. H.; Burt, A. D.; Reiskind, H. I., "A Record Changer and Record of Complementary Design", ''RCA Review'', June 1949 * {{DEFAULTSORT:Single Audio storage