Background: Can was a German experimental rock band formed in Cologne, West Germany, in 1968 by the core quartet of Holger Czukay (bass), Irmin Schmidt (keyboards), Michael Karoli (guitar), and Jaki Liebezeit (drums). The group cycled through several vocalists, including Malcolm Mooney (1968-70) and Damo Suzuki (1970-73), as well as various temporary members. Drawing from backgrounds in the avant-garde and jazz, Can incorporated minimalist, electronic, and world music elements into their often psychedelic and funk-inflected music. They have been widely hailed as pioneers of the German krautrock scene.
Context: The next few years saw Can release their most acclaimed works. While their earlier recordings tended to be at least loosely based on traditional song structures, on their mid-career albums the band reverted to an extremely fluid improvisational style. The double album Tago Mago (1971) is often seen as a groundbreaking, influential and deeply unconventional record, based on intensely rhythmic jazz-inspired drumming, improvised guitar and keyboard soloing (frequently intertwining each other), tape edits as composition, and Suzuki's idiosyncratic vocalisms. Czukay: "(Tago Mago) was an attempt in achieving a mystery musical world from light to darkness and return."  In 1971 the band composed the music for the three-part German-language television crime mini-series Das Messer ("The Knife"), directed by Rolf von Sydow. The track used was "Spoon".  Tago Mago was followed in 1972 by Ege Bamyasi, a more accessible but still avant-garde record which featured the catchy "Vitamin C" and the Top 10 German hit "Spoon". Czukay: "We could achieve an excellent dry and ambient sound... [Ege Bamyasi] reflects the group being in a lighter mood."  It was followed by Future Days in 1973, which represents an early example of ambient music, as well as including the pop song "Moonshake". Czukay: "'Bel Air' [the 20 minute-long track which took up the whole of side two on the Future Days original vinyl LP] showed Can in a state of being an electric symphony group performing a peaceful though sometimes dramatic landscape painting."  Suzuki left soon after the recording of Future Days to marry his German girlfriend, and become a Jehovah's Witness. Vocals were taken over by Karoli and Schmidt; however, after the departure of Suzuki, fewer of their tracks featured vocals, as Can found themselves experimenting with the ambient music they had begun with Future Days.
Question: Who produced this album ?

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