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A form where no musical section is repeated, leading to continuous, non-repetitive development. Common in art music, but can be found in jazz compositions such as some of Charles Mingus' works.

Typically slower in tempo and highly expressive, often using AABA or ABAC form. Jazz ballads include 'Body and Soul' and 'In a Sentimental Mood'.

A musical structure consisting of four 8-bar sections, where the first, second, and fourth sections (the A parts) are musically identical, and the third (the B part) contrasts melodically and harmonically. 'Over the Rainbow' and 'I Got Rhythm' are classic examples.

A type of jazz composition or improvisation where the structure and arrangement are spontaneously created by the musicians as they perform. Common examples include the informal jam sessions of the Swing era.

Derived from George Gershwin's 'I Got Rhythm', rhythm changes refer to the AABA form and chord progression used in many jazz compositions. Examples include 'Anthropology' by Charlie Parker and 'Oleo' by Sonny Rollins.

Uses modal scales as a harmonic framework, focusing on improvisation within modes rather than through chord changes. Famous examples include Miles Davis' 'So What' and John Coltrane's 'Impressions'.

A form derived from Cuban dance music, featuring repetitive piano patterns called 'montunos' over a syncopated rhythm. Used in Latin jazz and increasingly in mainstream jazz compositions.