Perpetuum mobile Musical Joke, op.257 Perpetuum mobile(Musical Joke) op.257 Perpetuum mobile - A musical fun op.257 Perpetuum mobile, Musikalischer Scherz, op. 257 Perpetuum mobile.Musikalischer Scherz,op.257 Perpetuum mobile, op.257 Perpetuum mobile op.257 Perpetuum mobile, Op.257 Qerpetuum mobile, op. 257 Perpetum mobile (perpetual motion),op.257