It's in 3 parts:

This is a really great documentary about progressive music and bands like Yes, Genesis, ELP, King Crimson, Jethro Tull, Caravan and Egg.

The film is about the rise and fall of a genre of music, the psychedelic pop scene, the death of progressive rock and the birth of punk.

Featuring Robert Wyatt, Mike Oldfield, Pete Sinfield, Rick Wakeman, Phil Collins, Arthur Brown, Carl Palmer, Ian Anderson and others.

Watching it, I could imagine a fantastic feature film, a mix of Robert Altman and PT Anderson with great music much like "Velvet Goldmine."