Music to Dig By: Pink Floyd plays Pompeii

In October 1971, Pink Floyd recorded six songs in the amphitheater of Pompeii, without an audience. The film 'Live At Pompeii' was released in 1972 (and a director's cut in 2003).

Super epic and purely theatrical at the same time. The lack of an audience symbolizes what happened with progressive rock: the 18-minute jam became the end in itself, without the need to hold a live audience. 'Album-oriented rock' is meant to listen to at home, alone, and stoned, so you don't mind the fact that the song never ends.

Still sounds rad though. Here's 'Echoes', Part Two: