The Night Frank Zappa Jammed With Pink Floyd ... and Captain Beefheart Too (Belgium, 1969)
Briefly

The end of the sixties saw a rich evolution of psychedelic and space rock genres, characterized by bands that blended prog, jazz, blues, and experimentation.
Frank Zappa's involvement at the Actuel Rock Festival emphasized the collaborative and exploratory spirit of the era, with psychedelic music at its forefront.
Read at Open Culture
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