Zappa jamming with Pink Floyd

Nick Mason and Zappa.

The Pink Floyd 27 CD/DVD box The Early Years 1965-72 sure is expensive ($ 550) but it does however include som interesting gems. One of them is a film of the Floyds jamming with Frank Zappa at Music Power & European Music Revolution, at Amougies Mont de l’Enclus, Belgium, 25 October 1969. 

Watch the footage here

Zappa was the MC of the festival. For a long time it was debated if this jam really took place since Zappa denied it. Some years ago sound and photos began leaking out and on this film we can clearly see and hear Zappa sitting in with Pink Floyd.
The track is the instrumental Interstellar Overdrive. Maybe not the best jam, but still a historical document.