This German band taped everything it played in the late Sixties and Seventies – jams, live recordings, studio collages. Can then used the raw materials to build its pioneering avant-rock albums. These outtakes, improvisations and gig extracts, left behind during construction, are as gripping as anything on the original LPs. The sequencing is a jolting montage of eras and voices (singers Malcolm Mooney and Damo Suzuki), but there is consistent risk and pull in the long throb of "Spoon" and the frantic psychedelia of "On the Way to Mother Sky."

Listen to 'The Lost Tapes':