A song is a
musical composition
Musical composition can refer to an original piece or work of music, either vocal or instrumental, the structure of a musical piece or to the process of creating or writing a new piece of music. People who create new compositions are called ...
intended to be performed by the
human voice
The human voice consists of sound made by a human being using the vocal tract, including talking, singing, laughing, crying, screaming, shouting, humming or yelling. The human voice frequency is specifically a part of human sound production ...
. This is often done at
distinct and fixed pitches (melodies) using patterns of sound and silence. Songs contain various
form
Form is the shape, visual appearance, or configuration of an object. In a wider sense, the form is the way something happens.
Form also refers to:
*Form (document), a document (printed or electronic) with spaces in which to write or enter data
...
s, such as those including the repetition and variation of sections.
Written words created specifically for music, or for which music is specifically created, are called
lyrics
Lyrics are words that make up a song, usually consisting of verses and choruses. The writer of lyrics is a lyricist. The words to an extended musical composition such as an opera are, however, usually known as a "libretto" and their writer, a ...
. If a pre-existing poem is set to composed music in classical music it is an
art song
An art song is a Western vocal music composition, usually written for one voice with piano accompaniment, and usually in the classical art music tradition. By extension, the term "art song" is used to refer to the collective genre of such songs ...
. Songs that are sung on repeated pitches without distinct contours and patterns that rise and fall are called
chant
A chant (from French ', from Latin ', "to sing") is the iterative speaking or singing of words or sounds, often primarily on one or two main pitches called reciting tones. Chants may range from a simple melody involving a limited set of notes ...
s. Songs composed in a simple style that are learned informally "by ear" are often referred to as
folk song
Folk music is a music genre that includes #Traditional folk music, traditional folk music and the Contemporary folk music, contemporary genre that evolved from the former during the 20th-century folk revival. Some types of folk music may be c ...
s. Songs that are composed for professional singers who sell their recordings or live shows t