In a pre-Dark Side of the Moon world, "Astronomy Domine" was Pink Floyd's calling card, single-handedly generating every space-rock cliché and exposing rock's true psychedelic potential. Forget Jerry Garcia and Jefferson Airplane: According to Syd Barrett's brilliantly warped songwriting, mind expansion and intergalactic research could only be conducted through NASA morse code, academic electronics, time-rippling guitar echoes, and tabernacle vocals about Saturnian staircases. --Alex Linhardt