Free jazz in the context of "Tone cluster"

In music, extended technique is unconventional, unorthodox, or non-traditional methods of singing or of playing musical instruments employed to obtain unusual sounds or timbres.

Composers’ use of extended techniques is not specific to contemporary music (for instance, Hector Berlioz’s use of col legno in his Symphonie Fantastique is an extended technique) and it transcends compositional schools and styles. Extended techniques have also flourished in popular music. Nearly all jazz performers make significant use of extended techniques of one sort or another, particularly in more recent styles like free jazz or avant-garde jazz. Musicians in free improvisation have also made heavy use of extended techniques.

Jazz improvisation is the spontaneous invention of melodic solo lines or accompaniment parts in a performance of jazz music. It is one of the defining elements of jazz. Improvisation is composing on the spot, when a singer or instrumentalist invents melodies and lines over a chord progression played by rhythm section instruments (piano, guitar, double bass) and accompanied by drums. Although blues, rock, and other genres use improvisation, it is done over relatively simple chord progressions which often remain in one key (or closely related keys using the circle of fifths, such as a song in C Major modulating to G Major).

Jazz improvisation is distinguished from this approach by chordal complexity, often with one or more chord changes per bar, altered chords, extended chords, tritone substitution, unusual chords (e.g., augmented chords), and extensive use of ii–V–I progression, all of which typically move through multiple keys within a single song. However, since the release of Kind of Blue by Miles Davis, jazz improvisation has come to include modal harmony and improvisation over static key centers, while the emergence of free jazz has led to a variety of types of improvisation, such as "free blowing", in which soloists improvise freely and ignore the chord changes.

The Electric Eels (stylized in lowercase in honor of E. E. Cummings) were an American rock band active between 1972 and 1975, formed by John D Morton in Cleveland, Ohio.

The Electric Eels played only five public shows, but during their brief existence they earned a reputation locally for being angry, confrontational and violent. They were notorious for starting fights with audiences which drew police attention; members were also abusive to each other off-stage. Their style was a discordant, noisy amalgam of hard garage rock and free jazz. Stiv Bators, the singer of The Dead Boys, was particularly influenced by the vocal styling and stage presence of Dave "E" McManus. While the Eels didn't play many shows, they rehearsed often, eventually making many recordings which were released many years after their demise.

Free improvisation (also known as free form music or free music) is a form of improvised music centered on a commitment to non-idiomatic musical expression. It is inspired by free jazz, serialism and indeterminacy, and is characterized by a general rejection of formal music theory and tonality, instead following the intuition of its performers. The term can refer to both a technique—employed by any musician in any genre—and as a recognizable genre of experimental music in its own right.

Free improvisation, as a genre of music, developed primarily in the U.K. as well as the U.S. and Europe in the mid to late 1960s, largely as an outgrowth of free jazz and contemporary classical music. Exponents of free improvised music include saxophonists Evan Parker, Anthony Braxton, Peter Brötzmann, and John Zorn, composer Pauline Oliveros, trombonist George E. Lewis, guitarists Derek Bailey, Henry Kaiser and Fred Frith, bassists Damon Smith and Jair-Rohm Parker Wells and the improvising groups Spontaneous Music Ensemble and AMM.

Avant-garde jazz (also known as avant-jazz, experimental jazz, or "new thing") is a style of music and improvisation that combines avant-garde art music and composition with jazz. It originated in the early 1950s and developed through the late 1960s. One of the earliest developments within avant-garde jazz was that of free jazz, and the two terms were originally synonymous. Much avant-garde jazz is stylistically distinct, however, in that it lacks free jazz's thoroughly improvised nature and is either fully or partially composed.