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In page Kraftwerk:

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Early Kraftwerk line-ups from 1970 to 1974 fluctuated, as Hütter and Schneider worked with around a half-dozen other musicians during the preparations for and the recording of three albums and sporadic live appearances, including guitarist Michael Rother and drummer Klaus Dinger, who left to form Neu!.[1] The only constant figure in these line-ups was Schneider, whose main instrument at the time was the flute; at times he also played the violin and guitar, all processed through a varied array of electronic devices. Hütter, who left the band for eight months to focus on completing his university studies, played synthesizer and keyboards (including Farfisa organ and electric piano).[citation needed]