Free jazz is an approach to jazz music that was first developed in the 1950s and 1960s. Though the music produced by free jazz composers varied widely, the common feature was a dissatisfaction with the limitations of bebop, hard bop, and modal jazz, which had developed in the 1940s and 1950s. Each in their own way, free jazz musicians attempted to alter, extend, or break down the conventions of jazz, often by discarding hitherto invariable features of jazz, such as fixed chord changes or tempos. While usually considered experimental and avant-garde, free jazz has also oppositely been conceived as an attempt to return jazz to its "primitive", often religious roots, and emphasis on collective improvisation.

Free jazz is most strongly associated with the 1950s innovations of Ornette Coleman and Cecil Taylor and the later works of saxophonist John Coltrane. Other important pioneers included Charles Mingus, Eric Dolphy, Albert Ayler, Archie Shepp, Joe Maneri and Sun Ra. Although today "free jazz" is the generally-used term, many other terms were used to describe the loosely-defined movement, including "avant-garde", "energy music" and "The New Thing". During its early- and mid-60s heyday, much free jazz was released by the independent ESP Disk label.

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Jazz is a musical style that originated at the beginning of the 20th century in black communities in the Southern United States.

It was born out of a mix of African and European music traditions. Its African pedigree is evident in its use of blue notes, improvisation, polyrhythms, syncopation and the swung note. From its early development until the present day jazz has also incorporated music from American popular music.

As the music has developed and spread around the world it has drawn on many different national, regional and local musical cultures giving rise, since its early 20th century American beginnings, to many distinctive styles: New Orleans jazz dating from the early 1910s, big band swing, Kansas City jazz and Gypsy jazz from the 1930s and 1940s, bebop from the mid-1940s and on down through West Coast jazz, cool jazz, avant-garde jazz, Afro-Cuban jazz, modal jazz, free jazz, Latin jazz in various forms, soul jazz, jazz fusion and jazz rock, smooth jazz, jazz-funk, punk jazz, acid jazz, ethno jazz, jazz rap, cyber jazz, Indo jazz, M-Base, nu jazz, urban jazz and other ways of playing the music.

Ornette Coleman (born March 19, 1930) is an American saxophonist, violinist, trumpeter and composer. He was one of the major innovators of the free jazz movement of the 1960s.

Coleman's timbre is easily recognized: his keening, crying sound draws heavily on blues music. His album Sound Grammar received the 2007 Pulitzer Prize for music.

Coleman was born and raised in Fort Worth, Texas, where he began performing R&B and bebop initially on tenor saxophone. Seeking a way to work his way out of his home town, he took a job in 1949 with a Silas Green from New Orleans traveling show and then with touring rhythm and blues shows. After a show in Baton Rouge, he was assaulted and his saxophone was destroyed.

He switched to alto, which has remained his primary instrument, first playing it in New Orleans after the Baton Rouge incident. He then joined the band of Pee Wee Crayton and travelled with them to Los Angeles. He worked at various jobs, including as an elevator operator, while still pursuing his musical career.

Albert Ayler (July 13, 1936 – November 25, 1970) was an American avant-garde jazz saxophonist, singer and composer.

Ayler was among the most primal of the free jazz musicians of the 1960s; critic John Litweiler wrote that "never before or since has there been such naked aggression in jazz" He possessed a deep blistering tone—achieved by using the stiff plastic Fibrecane no. 4 reeds on his tenor saxophone—and used a broad, pathos-filled vibrato.

His trio and quartet records of 1964, like Spiritual Unity and The Hilversum Session, show him advancing the improvisational notions of John Coltrane and Ornette Coleman into abstract realms where whole timbre, and not just mainly harmony with melody, is the music's backbone. His ecstatic music of 1965 and 1966, like "Spirits Rejoice" and "Truth Is Marching In" has been compared by critics to the sound of a brass band, and involved simple, march-like themes which alternated with wild group improvisations and were regarded as retrieving jazz's pre-Louis Armstrong roots.