When the Can studio in Weilerswist was sold to the German Rock N Pop Museum,[12] they bought everything, including the army mattresses that covered the walls for sound protection, and relocated it to Gronau.

With barely legible labeling, no one was sure what was on these until Irmin Schmidt and long time collaborator Jono Podmore started to go through over 30 hours of music.

Irmin Schmidt explains "Obviously the tapes weren't really lost, but were left in the cupboards of the studio archives for so long everybody just forgot about them.

Everybody except Hildegard [Schmidt, Irmin's wife], who watches over Can and its work like the dragon over the gold of the Nibelungen and doesn't allow forgetting.

"[13] The final cut of tracks, dating from 1968 to 1977, features studio material recorded at Schloss Nörvenich and Can Studio, Weilerswist with the Can line-up of Holger Czukay on bass, Michael Karoli on guitars, Jaki Liebezeit on drums and Irmin Schmidt on keyboards, and on most tracks, vocals from Malcolm Mooney or Damo Suzuki.