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Free improvisation or free music is improvised music without any rules beyond the logic or inclination of the musician(s) involved. The term can refer to both a technique (employed by any musician in any genre) and as a recognizable genre in its own right. Free improvisation, as a genre of music, developed in the U.S. and Europe in the mid to late 1960s, largely as an outgrowth of free jazz and modern classical musics. Exponents of free improvised music include saxophonists Evan Parker, Anthony Braxton, Peter Brötzmann, and
John Zorn John Zorn (born September 2, 1953) is an American composer, conductor, saxophonist, arranger and producer who "deliberately resists category". Zorn's avant-garde and experimental approaches to composition and improvisation are inclusive of jaz ...
, composer Pauline Oliveros, drummer
Christian Lillinger Christian Lillinger (born 21 April 1984) is a German drummer, composer and percussionist. He was born in Lübben, grew up in the German village of Kuschkow, and has been living in Berlin since 2003 working as a musician and composer. Christian ha ...
, trombonist
George E. Lewis George Emanuel Lewis (born July 14, 1952) is an American composer, performer, and scholar of experimental music. He has been a member of the Association for the Advancement of Creative Musicians ( AACM) since 1971, when he joined the organization ...
, guitarists Derek Bailey,
Henry Kaiser Henry John Kaiser (May 9, 1882 – August 24, 1967) was an American industrialist who became known as the father of modern American shipbuilding. Prior to World War II, Kaiser was involved in the construction industry; his company was one of ...
and
Fred Frith Jeremy Webster "Fred" Frith (born 17 February 1949) is an English multi-instrumentalist, composer, and improviser. Probably best known for his guitar work, Frith first came to attention as one of the founding members of the English avant-rock ...
and the improvising groups Spontaneous Music Ensemble, The Music Improvisation Company, Iskra 1903, The Art Ensemble of Chicago and
AMM Amm or AMM may refer to: Entertainment Music *AMM (group), British free improvisation group Television *Amy's Mythic Mornings, an educational show on APTN Kids Video games * Automated MatchMaking, in the context of the Warcraft III Ladder system ...
.


Characteristics

In an atonal context, free improvisation refers to where the focus shifts from
harmony In music, harmony is the process by which individual sounds are joined together or composed into whole units or compositions. Often, the term harmony refers to simultaneously occurring frequencies, pitches ( tones, notes), or chords. However ...
to other dimensions of music: timbre, melodic intervals, rhythm and the spontaneous interaction between musicians. Although performers may choose to play in a certain style or key, or at a certain tempo, conventional songs are highly uncommon in free improvisation; more emphasis is generally placed on mood, texture or more simply, on performative gesture than on preset forms of
melody A melody (from Greek language, Greek μελῳδία, ''melōidía'', "singing, chanting"), also tune, voice or line, is a Linearity#Music, linear succession of musical tones that the listener perceives as a single entity. In its most liter ...
,
harmony In music, harmony is the process by which individual sounds are joined together or composed into whole units or compositions. Often, the term harmony refers to simultaneously occurring frequencies, pitches ( tones, notes), or chords. However ...
or rhythm. These elements are improvised at will, as the music progresses. John Eyles notes that guitarist Derek Bailey has been quoted as saying that free improvisation is "playing without memory". In his landmark book ''Improvisation'', Bailey writes, "The lack of precision over its ree improv'snaming is, if anything, increased when we come to the thing itself. Diversity is its most consistent characteristic. It has no stylistic or idiomatic commitment. It has no prescribed idiomatic sound. The characteristics of freely improvised music are established only by the sonic musical identity of the person or persons playing it." Free music performers, coming from a disparate variety of backgrounds, often engage musically with other genres. For example, acclaimed soundtrack composer
Ennio Morricone Ennio Morricone (; 10 November 19286 July 2020) was an Italian composer, orchestrator, conductor, and trumpeter who wrote music in a wide range of styles. With more than 400 scores for cinema and television, as well as more than 100 classica ...
was a member of the free improvisation group Nuova Consonanza. Anthony Braxton has written opera, and
John Zorn John Zorn (born September 2, 1953) is an American composer, conductor, saxophonist, arranger and producer who "deliberately resists category". Zorn's avant-garde and experimental approaches to composition and improvisation are inclusive of jaz ...
has written acclaimed orchestral pieces. As it has influenced and been influenced by other areas of exploration, aspects of
modern classical music Classical music generally refers to the art music of the Western world, considered to be distinct from Western folk music or popular music traditions. It is sometimes distinguished as Western classical music, as the term "classical music" also ...
( extended techniques), noise rock (aggressive confrontation and dissonance), IDM (computer manipulation and digital synthesis),
minimalism In visual arts, music and other media, minimalism is an art movement that began in post–World War II in Western art, most strongly with American visual arts in the 1960s and early 1970s. Prominent artists associated with minimalism include Don ...
and
electroacoustic music Electroacoustic music is a genre of popular and Western art music in which composers use technology to manipulate the timbres of acoustic sounds, sometimes by using audio signal processing, such as reverb or harmonizing, on acoustical instrumen ...
can now be heard in free improvisation.


History

Though there are many important precedents and developments, free improvisation developed gradually, making it difficult to pinpoint a single moment when the style was born. However, its lineage is linked to Afro-American music, particularly the experiments made in the 1960s commonly known as "Free Jazz." The musical advancements made through improvisation through Free Jazz served as inspiration to European musicians, who then created "Free Improvisation" as a differentiation. British Guitarist Derek Bailey contends that free improvisation must have been the earliest musical style, because "mankind's first musical performance couldn't have been anything other than a free improvisation." Similarly,
Keith Rowe Keith may refer to: People and fictional characters * Keith (given name), includes a list of people and fictional characters * Keith (surname) * Keith (singer), American singer James Keefer (born 1949) * Baron Keith, a line of Scottish barons ...
stated, "Other players got into playing freely, way before AMM, way before Derek
ailey Ailey is a city in Montgomery County, Georgia, United States. As of the 2020 census, the city had a population of 519. It is part of the Vidalia Micropolitan Statistical Area. History A post office called Ailey was established in 1891. The to ...
Who knows when free playing started? You can imagine
lute A lute ( or ) is any plucked string instrument with a neck and a deep round back enclosing a hollow cavity, usually with a sound hole or opening in the body. It may be either fretted or unfretted. More specifically, the term "lute" can ref ...
players in the 1500s getting drunk and doing improvisations for people in front of a log fire.. the noise, the clatter must have been enormous. You read absolutely incredible descriptions of that. I cannot believe that musicians back then didn't float off into free playing. The melisma in Monterverdi must derive from that. But it was all in the context of a repertoire." At the same time, Free Improvisation is a problematic term. It is neither free nor improvised as in their strict definitions. Musicians who play free improvisation develop highly individualized musical vocabulary which are then played without the restriction of a score. In this sense, the freedom implied by the term Free Improvisation is more of an aesthetic of playing towards notions of freedom than freedom in the pure sense.


Classical precedents

By the middle decades of the 20th century, composers like
Henry Cowell Henry Dixon Cowell (; March 11, 1897 – December 10, 1965) was an American composer, writer, pianist, publisher and teacher. Marchioni, Tonimarie (2012)"Henry Cowell: A Life Stranger Than Fiction" ''The Juilliard Journal''. Retrieved 19 June 202 ...
, Earle Brown, David Tudor,
La Monte Young La Monte Thornton Young (born October 14, 1935) is an American composer, musician, and performance artist recognized as one of the first American minimalist composers and a central figure in Fluxus and post-war avant-garde music. He is best kno ...
, Jackson Mac Low, Morton Feldman, Sylvano Bussotti, Karlheinz Stockhausen, and
George Crumb George Henry Crumb Jr. (24 October 1929 – 6 February 2022) was an American composer of avant-garde contemporary classical music. Early in his life he rejected the widespread modernist usage of serialism, developing a highly personal musical ...
, re-introduced improvisation to European art music, with compositions that allowed or even required musicians to improvise. One notable example of this is Cornelius Cardew's '' Treatise'': a
graphic score Graphic notation (or graphic score) is the representation of music through the use of visual symbols outside the realm of traditional music notation. Graphic notation became popular in the 1950s, and can be used either in combination with or instea ...
with no conventional notation whatsoever, which musicians were invited to interpret. Improvisation is still commonly practised by some organists at concerts or church services, and courses in improvisation (including free improvisation) are part of many higher education programmes for church musicians. Notable contemporary organists include Olivier Latry and
Jean Guillou Jean Victor Arthur Guillou (18 April 1930 – 26 January 2019) was a French composer, organist, pianist, and pedagogue. Titular Organist at Saint Eustache in Paris, from 1963 to 2015, he was widely known as a composer of instrumental and voca ...
. Free improvisations for organ has also occasionally been recorded and released on albums, such as Like a Flame by Frederik Magle.


Jazz precedents

Improvisation has been a central element of jazz since the music's inception, but until the 1950s, such improvisation was typically clearly within the jazz idiom and based on prescribed traditions. Perhaps the earliest free recordings in jazz are two pieces recorded under the leadership of jazz pianist Lennie Tristano: "Intuition", and "Digression", both recorded in 1949 with a quintet including saxophone players
Lee Konitz Leon Konitz (October 13, 1927 – April 15, 2020) was an American composer and alto saxophonist. He performed successfully in a wide range of jazz styles, including bebop, cool jazz, and avant-garde jazz. Konitz's association with the cool jazz ...
and Warne Marsh. In 1954 Shelly Manne recorded a piece called "Abstract No. 1" with trumpeter Shorty Rogers and reedsmith Jimmy Giuffre which was freely improvised. Jazz critic Harvey Pekar has also pointed out that one of Django Reinhardt's recorded improvisations strays drastically from the chord changes of the established piece. While noteworthy, these examples were clearly in the jazz idiom. In the late 1950s and early 1960s, the free jazz movement coalesced around such important (and disparate) figures as
Cecil Taylor Cecil Percival Taylor (March 25, 1929April 5, 2018) was an American pianist and poet. Taylor was classically trained and was one of the pioneers of free jazz. His music is characterized by an energetic, physical approach, resulting in complex ...
, Sun Ra,
Ornette Coleman Randolph Denard Ornette Coleman (March 9, 1930 – June 11, 2015) was an American jazz saxophonist, violinist, trumpeter, and composer known as a principal founder of the free jazz genre, a term derived from his 1960 album '' Free Jazz: A Colle ...
, and John Coltrane, as well as many lesser-known figures such as Joe Maneri and Joe Harriott. Free jazz allowed for radical improvised departures from the harmonic and rhythmic material of the composition – for instance, by permitting performers to ignore conventional repeating song-structures. Such music often seemed far removed from the preceding jazz tradition, even though it almost always preserved one or more central elements of that tradition while abandoning others. These ideas were extended in the 1962 '' Free Fall'' recording by jazz clarinetist Jimmy Giuffre's trio, featuring music that was often freely and spontaneously improvised, and which had only tenuous similarity to established jazz styles. Another important recording was '' New York Eye and Ear Control'' (1964), a soundtrack for a film by Michael Snow, recorded for the ESP-Disk label under the leadership of saxophonist Albert Ayler. Snow suggested to Ayler that the band simply play without a composition or themes. The Spontaneous Music Ensemble was formed by John Stevens and Trevor Watts in the mid-1960s and included, at various times, influential players such as Derek Bailey, Evan Parker, Kenny Wheeler, Roger Smith, and John Butcher. As with the Association for the Advancement of Creative Musicians (AACM), many of these players began in jazz, but gradually pushed the music into a zone of abstraction and relative quietude. The British record label
Emanem Emanem Records is a record company and independent record label founded in London, England in 1974 by Martin Davidson and Madelaine Davidson to record free improvisation. Its headquarters moved to New York City (1975–76), New Jersey (1979, ...
has documented much music in this vein. There was (and continues to be) often considerable blurring of the line between free jazz and free improvisation. The Chicago-based AACM, a loose collective of improvising musicians including Muhal Richard Abrams, Henry Threadgill, Anthony Braxton,
Jack DeJohnette Jack DeJohnette (born August 9, 1942) is an American jazz drummer, pianist, and composer. Known for his extensive work as leader and sideman for musicians including Charles Lloyd, Freddie Hubbard, Keith Jarrett, Bill Evans, John Abercrombie, ...
, Lester Bowie,
Roscoe Mitchell Roscoe Mitchell (born August 3, 1940) is an American composer, jazz instrumentalist, and educator, known for being "a technically superb – if idiosyncratic – saxophonist". ''The Penguin Guide to Jazz'' described him as "one of the key figures ...
, Joseph Jarman, Famadou Don Moye,
Malachi Favors Malachi Favors (August 22, 1927 – January 30, 2004) was an American jazz bassist who played with the Art Ensemble of Chicago. Biography "Favors's tendency to dissemble about his age was a well-known source of mirth to fellow musicians of his g ...
and
George E. Lewis George Emanuel Lewis (born July 14, 1952) is an American composer, performer, and scholar of experimental music. He has been a member of the Association for the Advancement of Creative Musicians ( AACM) since 1971, when he joined the organization ...
was formed in 1965 and included many of the key players in the nascent international free improv scene. (Braxton recorded many times with Bailey and Teitelbaum; Mitchell recorded with Thomas Buckner and Pauline Oliveros.) In 1966
Elektra Records Elektra Records (or Elektra Entertainment) is an American record label owned by Warner Music Group, founded in 1950 by Jac Holzman and Paul Rickolt. It played an important role in the development of contemporary folk and rock music between the 1 ...
issued the first recording of European free improvisation by the UK group
AMM Amm or AMM may refer to: Entertainment Music *AMM (group), British free improvisation group Television *Amy's Mythic Mornings, an educational show on APTN Kids Video games * Automated MatchMaking, in the context of the Warcraft III Ladder system ...
, which included at the time Cornelius Cardew,
Eddie Prévost Edwin John Prévost (born 22 June 1942) is an English percussionist who founded the free improvisation group, AMM. Early years Of Huguenot heritage, Prévost's silk weaving ancestors moved to Spitalfields in the late 17th century. He was bor ...
, Lou Gare,
Keith Rowe Keith may refer to: People and fictional characters * Keith (given name), includes a list of people and fictional characters * Keith (surname) * Keith (singer), American singer James Keefer (born 1949) * Baron Keith, a line of Scottish barons ...
and Lawrence Sheaff. In 1967 classical strings-focused
Just Music Just Music were a West German avant-garde music ensemble, an interchangeable collective of classically trained instrumentalists founded at the , Frankfurt/Main in 1967 by multi-instrumentalist Alfred Harth. An inherent anti-commercial bias kept th ...
had been formed by
Alfred Harth Alfred Harth, now known as Alfred 23 Harth or A23H, is a German multimedia artist, band leader, multi-instrumentalist musician, and composer who creatively mixes genres. Career Harth founded a free improvisation band, Just Music (1967 to 1972) ...
and been recorded on
ECM ECM may refer to: Economics and commerce * Engineering change management * Equity capital markets * Error correction model, an econometric model * European Common Market Mathematics * Elliptic curve method * European Congress of Mathematics ...
(1002) in 1969 in West Germany.


International free improvisation

Through the remainder of the 1960s and through the 1970s, free improvisation spread across the U.S., Europe and East Asia, entering quickly into a dialogue with Fluxus, happenings, performance art and rock music. By the mid-1970s, free improvisation was truly a worldwide phenomenon. In 1976 Derek Bailey founded and curated
Company Week A company, abbreviated as co., is a legal entity representing an association of people, whether natural, legal or a mixture of both, with a specific objective. Company members share a common purpose and unite to achieve specific, declared go ...
, the first of an annual series of improvised music festivals in which Bailey programmed performances by ad hoc ensembles of musicians who in many cases had never played with each other before. This '' musical chairs'' approach to collaboration was a characteristically provocative gesture by Bailey, perhaps in response to John Stevens' claim that musicians needed to collaborate for months or years in order to improvise well together. The final Company Week was in 1994. Since 2002 New Zealand collective Vitamin S has hosted weekly improvisations based around randomly drawn trios. Vitamin S takes the form beyond music and includes improvisers from other forms such as dance, theatre and puppetry. Since 2006, improvisational music in many forms has been supported and promoted by ISIM, the International Society for Improvised Music, founded by Ed Sarath of the University of Michigan and Sarah Weaver. ISIM comprises some 300 performing artists and scholars worldwide, including Pauline Oliveros, Oliver Lake, Thomas Buckner, Robert Dick, India Cooke, Jane Ira Bloom, Karlton Hester,
Roman Stolyar Roman Stolyar (born December 6, 1967) is a Russian composer, piano improviser and educator. Career Born in Novosibirsk, Siberia, in a family of engineers, Stolyar graduated from Novosibirsk College of Music as a jazz pianist and from Novosibir ...
, Mark Dresser, and many others. Founded in Manchester, England, in 2007, ''the Noise Upstairs'' has been an institution dedicated to the practice of improvised music, hosting regular concerts and creative workshops where they have promoted international and UK-based artists such as Ken Vandermark, Lê Quan Ninh, Ingrid Laubrock, Beats & Pieces Big Band, and Yuri Landman. On top of these events, the Noise Upstairs runs monthly jam nights, the premise being that anyone can turn up and join in by putting their name in the hat and trios are chosen at random to freely improvise together. These jam session also include a set from special guests which have included many international musicians such as Jason Kahn, Sonia Paço-Rocchia, Daniele Ledda, Helmut Lemke and Christine Sehnaoui, as well as top UK improvisers Mick Beck, Phil Marks, Pete Fairclough, Shatner's Bassoon, Anton Hunter, Rodrigo Constanzo, Johnny Hunter, Martin Archer, Sam Andreae, Seth Bennett, John Jasnoch and Charlie Collins, among many more. Other groups such as the 1984ensemble, which was formed in 2013 by trombonist Kris T Reeder in Oxford, featuring musicians from the Oxford Improvisers have expanded free-improvisation, using live electronic and acoustic instruments with computers.


The downtown scene

In late 1970s New York a group of musicians came together who shared an interest in free improvisation as well as rock, jazz, contemporary classical, world music and pop. They performed at lofts, apartments, basements and venues located predominantly in downtown New York (
8BC 8BC was a nightclub, performance space, and art gallery located at 337 East 8th Street in the East Village neighborhood of New York, New York. Founded in 1983, the space closed in late 1985. History In 1980 co-founder Cornelius Conboy purchased ...
, Pyramid Club, Environ,
Roulette Roulette is a casino game named after the French word meaning ''little wheel'' which was likely developed from the Italian game Biribi''.'' In the game, a player may choose to place a bet on a single number, various groupings of numbers, the ...
, Studio Henry, Someplace Nice, The Saint, King Tut's Wa Wa Hut and later The Knitting Factory and Tonic) and held regular concerts of free improvisation which featured many of the prominent figures in the scene, including
John Zorn John Zorn (born September 2, 1953) is an American composer, conductor, saxophonist, arranger and producer who "deliberately resists category". Zorn's avant-garde and experimental approaches to composition and improvisation are inclusive of jaz ...
, Bill Laswell,
George E. Lewis George Emanuel Lewis (born July 14, 1952) is an American composer, performer, and scholar of experimental music. He has been a member of the Association for the Advancement of Creative Musicians ( AACM) since 1971, when he joined the organization ...
,
Fred Frith Jeremy Webster "Fred" Frith (born 17 February 1949) is an English multi-instrumentalist, composer, and improviser. Probably best known for his guitar work, Frith first came to attention as one of the founding members of the English avant-rock ...
, Tom Cora, Toshinori Kondo, Wayne Horvitz, Eugene Chadbourne, Zeena Parkins, Anthony Coleman, Polly Bradfield, Ikue Mori, Robert Dick,
Ned Rothenberg Ned Rothenberg (born September 15, 1956) is an American multi-instrumentalist and composer. He specializes in woodwind instruments, including the alto saxophone, clarinet, bass clarinet, flute, and shakuhachi (Japanese bamboo flute). He is known ...
,
Bob Ostertag Robert "Bob" Ostertag (born April 19, 1957) is a musician, writer, and political activist based in San Francisco. He has published seven books, one feature film, a DVD, twenty-six albums, and collaborated with numerous musicians. Musically, he ...
, Christian Marclay, David Moss, Kramer and many others. They worked with each other, independently and with many of the leading European improvisers of the time, including Derek Bailey, Evan Parker, Han Bennink, Misha Mengelberg, Peter Brötzmann and others. Many of these musicians continue to use improvisation in one form or another in their work. In the tradition of Derek Bailey's Company Week, monthly Improv Nights have become a tradition at John Zorn's East Village performance space The Stone. Organized as benefits to raise the expenses needed to keep the venue operational, these concerts of improvised music have featured hundreds of musicians from a variety of backgrounds, generations and traditions.


Electronic free improvisation

Electronic devices such as oscillators, echoes, filters and alarm clocks were an integral part of free improvisation performances by groups such as Kluster at the underground scene at Zodiac Club in Berlin in the late 1960s. For the 1975 jazz-rock concert recording ''
Agharta Agartha (sometimes Agartta, Agharti, Agarath, Agarta, Agharta, or Agarttha) is a legendary kingdom that is said to be located in the Earth's core. It is related to the belief in a hollow Earth and is a popular subject in esotericism. History The ...
'', Miles Davis and his band employed free improvisation and electronics, particularly guitarist Pete Cosey who improvised sounds by running his guitar through a ring modulator and an EMS Synthi A. But it was only later that traditional instruments were disbanded altogether in favour of pure electronic free improvisation. In 1984, the Swiss improvisation duo Voice Crack started making use of strictly "cracked everyday electronics". More recently, electronic free improvisation has drawn on
Circuit bending Circuit bending is the creative, chance-based customization of the circuits within electronic devices such as low-voltage, battery-powered guitar effects, children's toys and digital synthesizers to create new musical or visual instruments and ...
,
Noise music Noise music is a genre of music that is characterised by the expressive use of noise within a musical context. This type of music tends to challenge the distinction that is made in conventional musical practices between musical and non-musical ...
, DIY-culture and Turntablism, represented by performers such as Otomo Yoshihide, Hemmelig Tempo, Günter Müller, poire z, and many others.


Electroacoustic improvisation

A recent branch of improvised music is characterized by quiet, slow moving, minimalistic textures and often utilizing laptop computers or unorthodox forms of electronics. Developing worldwide in the mid-to-late 1990s, with centers in New York, Tokyo and Austria, this style has been called '' lowercase music'' or EAI ( electroacoustic improvisation), and is represented, for instance, by the American record label Erstwhile Records and the Austrian label Mego. EAI is often radically different even from established free improvisation. Eyles writes, "One of the problems of describing this music is that it requires a new vocabulary and ways of conveying its sound and impact; such vocabulary does not yet exist – how do you describe the subtle differences between different types of controlled feedback? I've yet to see anyone do it convincingly – hence the use of words like 'shape' and 'texture'!"


Free improvisation on the radio

The London-based independent radio station
Resonance 104.4FM Resonance 104.4 FM is a London based non-profit community radio station specialising in the arts run by the London Musicians' Collective (LMC). The station is staffed by four permanent staff members, including programme controller Ed Baxter and ...
, founded by the London Musicians Collective, frequently broadcasts experimental and free improvised performance works.
WNUR 89.3 FM WNUR-FM (89.3 FM) is a 7,200–watt radio station based in Evanston, Illinois that broadcasts to Chicago and its northern suburbs. It is the student radio station of Northwestern University. History WNUR first began broadcasting on May ...
("Chicago's Sound Experiment") is another source for free improvised music on the radio. Taran's Free Jazz Hour broadcast on Radio-G 101.5 FM, Angers and 101.3 FM,
Nantes Nantes (, , ; Gallo: or ; ) is a city in Loire-Atlantique on the Loire, from the Atlantic coast. The city is the sixth largest in France, with a population of 314,138 in Nantes proper and a metropolitan area of nearly 1 million inhabita ...
is entirely dedicated to free jazz and other freely improvised music. A l'improviste, (France musique) French Radio, Listen online the last four broadcasts, only free music every week by Anne Montaron. Based in the neighboring town of Newton, Boston is served with a good amount of free improvisation music from Boston College's non-commercial radio station 90.3 FM WZBC, as part of its vast number of experimental programs.


See also

* Aesthetics of music *
Avant-garde music Avant-garde music is music that is considered to be at the forefront of innovation in its field, with the term "avant-garde" implying a critique of existing aesthetic conventions, rejection of the status quo in favor of unique or original elemen ...
*
Experimental music Experimental music is a general label for any music or music genre that pushes existing boundaries and genre definitions. Experimental compositional practice is defined broadly by exploratory sensibilities radically opposed to, and questioning of, ...
* Intuitive music * Musical collective * Musics (magazine) * Surrealist music * List of free improvising musicians and groups


References


External links


International Society for Improvised Music

''Signal to Noise'' magazine
A publication on avant-garde jazz and electro-acoustic improvisation

{{DEFAULTSORT:Free Improvisation Jazz genres Jazz techniques Jazz terminology