Groupcomposing by Misha Mengelberg, Peter Brötzmann, Evan Parker, Peter Bennink, Paul Rutherford, Derek Bailey, Han Bennink, released on Instant Composers Pool in 1978.

...With its Bennink cover – take that Andy Warhol! – and its two side-long tracks, it is an improvised music aficionado's treasure. Mengelberg and Bennink are joined by Bennink's brother, Peter Bennink, on alto saxophone and bagpipes (!), with an incredible reed section of Evan Parker and Peter Brötzmann, Paul Rutherford on trombone, and Derek Bailey on guitar. Moving from peaks of intensity to droning deescalation, totally improvised live in concert in 1970, Groupcomposing should be heard in the company of related records like Brötzmann's Machine Gun and Nipples, the early London Jazz Composer's Orchestra...

https://corbettvsdempsey.bandcamp.com/album/groupcomposing

https://www.youtube.com/watch?v=S2TKejjdIRY

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