Pink Floyd started out in the late sixties, making a deep impression with their psychedelic sound. The real and relatively unknown gem from their early period is the 1969 song Julia dream, which can be found on the 1971 collection album Relics. The lyrics are heavily drug-induced ("Every night I turn the light out, waiting for the velvet bride - Will the scaly armadillo find me where I'm hiding"), but the beautiful melody and effective instrumentation turns this song into an absolute classic. The video made by a fan really suits the music as well.
Art Rock score: 10/10 (brilliant masterpiece, one of 200 best songs of all time)