The Experience Edition of Wish You Were Here. I just had to buy it because the 2nd CD has 3 live tracks from the very concert I went to in November 1974. There is a 20 minute version of Shine On plus Raving and Drooling and You've Got To Be Crazy which became Sheep and Dogs on the Animals LP. The sound quality is astonishing (but probably because I only know the tracks from a very poor quality bootleg).
Ahhh, memories!