"Certain ideas were really stupid and absurd, but we wrote them down anyway just for the sake of laughter. We would do things like: choose a key for a piece, record it, then leave, and whoever came in had as their only indication the key. They would also record on the same tape without having heard what the others had played" (David Gilmour) 1971... Pink Floyd - Meddle: Pink Floyd Echoes & 2001 A Space Odyssey HD