Avant-progressive rock

Avant-progressive rock is a style of rock music that explores unconventional territory, often incorporating non-standard chord progressions,

Avant-progressive rock is a style of rock music that explores unconventional territory, often incorporating non-standard chord progressions, tempo changes within a piece, odd time signatures, avant garde passages and complex horn and orchestral arrangements. It generally relates to experimental bands and musicians influenced by 20th century avant garde, classical, jazz, folk and other music, and who stretch the boundaries of the rock form in both the compositional and improvisational arenas.

Often the only similarities between groups creating avant-progressive rock music is their disregard of convention.