Amon Duul's 1969 debut-LP Psychedelic Underground, here reissued on vinyl, is music at its most experimental and relentlessly uncommercial, using late '60s influences as a launching ground for what would become known as Krautrock. Taken from a jam session from the previous year, but treated with many studio effects that enhance the strangeness of the collection, Psychedelic Underground rocks to its own weird beat.