"The Screaming Abdabs" bootleg. This is the 1972 live recording, taken from the board, of Pink Floyd playing "Dark Side" in a small club, before recording the album. Everything else pales by comparison, if you can get by the poor sonics, that is. Rick Wright's keyboard parts are much looser, and Gilmore plays much jazzier. It is as if something that you have known your whole life was suddenly different, imbued with an alternate meaning, and possessing a depth not previously realized.