Formed at the University of Detroit in 1967, Index cut one of the most excruciatingly rare psychedelic albums of all time, pressed in an edition of a mere 100 copies. No, it's not worth the $3,000 it lists for in Goldmine's price guide, but it's certainly a nifty, even one-of-a-kind curiosity (and fortunately, it was reissued in the '80s).