"Before I joined Kraftwerk in 1971, I played guitar in a band called Spirits of Sound, whose members included (at times) amongst others singer Wolfgang Riechmann (Sky Records released his only solo album Wunderbar shortly after his death in 1978) and drummer Wolfgang Flür (later on Kraftwerk, now solo). The music of S.o.S. in the mid 60's first was the English pop and rock music of the times (Beatles, Kinks, Rolling Stones )."

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As a conscientious objector I did my community service in 1971 in a psychiatric hospital and a friend there, who also was a guitar player, invited me one day to join him recording film music with a band named Kraftwerk which I didn't know at the time. I came along and jammed at this session together with Ralf Hütter and a drummer (I believe his name was Charly Weiß). Florian Schneider and Klaus Dinger were present as listeners and everybody liked the spontaneous music we did together.

— Michael Rother