Avant-prog

Avant-garde progressive rock (also called avant-prog and experimental prog) is a style that appeared in the late 1960s as the extension of two separate prog rock sub-styles. A host of groups and artists mainly from the USA, but also from Europe and Japan, started to write mostly short instrumental pieces that focused on complexity and stripped down instrumentation, while avoiding the pomposity and stage props of the big progressive rock acts. Some groups (Thinking Plague and the Motor Totemist Guild, for instance) kept working with long durations and rich instrumentation but also forayed into free improvisation, sound collage, and other avant-garde techniques.[1]

Frank Zappa's work with the Mothers of Invention could arguably be considered the earliest example of avant-prog. The genre rose to prominence through Henry Cow and the Rock in Opposition movement, involving bands such as Univers Zero and Samla Mammas Manna. Avant-prog never gained any real mainstream recognition, but the genre has remained active and popular as an underground phenomenon.[2]

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