Can's first album without a dedicated lead singer is a tour de force for the group. Without a vocalist on board, the band feel less need to create space for the vocals in their music and focus solely on their instrumental performances, singing only when they feel the music demands it. Michael Karoli's vocal contributions are the best of the group, his additions to Dizzy Dizzy in particular contributing to the sound of the composition much as Damo Suzuki's might have. The album's heart is the hypnotic and compelling duo of Chain Reaction and Quantum Physics, and overall this a masterful album which (as others have pointed out) would eventually exert a powerful influence over the post-rock scene.