Rufus Zuphall was a German underground quartet from Aachen, formed in 1969 by flautist, percussionist and saxophonist Klaus Gülden, guitarist and singer Günter Krause, bassist Helmut Lieblang and drummer Udo Dahmen. With their guitar-driven psychedelic blend of progressive rock, blues rock, hard rock and progressive folk – featuring prominent use of the flute – they played several successful live concerts, particularly in neighbouring countries close to the border, such as Belgium and the Netherlands. This included the jazz festival in Bilzen, Belgium, where in 1970 they gave a much-acclaimed performance in front of 30,000 spectators as the only amateur band to open for Black Sabbath, Cat Stevens and May Blitz.

This proved successful, as it raised their profile and led to the opportunity to record their own album. Later that same year, they recorded their first and legendary album Weiß Der Teufel live in just three days at the Gielkens & Proesch Studio in the Netherlands, with Erich Engels as a guest percussionist. It was self-released in a small print run and is today regarded by many as one of the best progressive private pressings from Germany and is highly sought after. After the release of their second and final LP Phallobst, they disbanded in 1972 due to personal and musical differences.