The name COS has been used more than once. The first was a Belgian band formed in the 70s. COS was lead by flautist/guitarist Daniel Schell and featured his wife, oboist/vocalist Pascale Son, who used nonsense syllables to suggest a semblance of language. They offer a mixture of progressive rock, jazz, avant-garde and canterbury scene styles. Joined on their first album, Postaeolian Train Robbery, by drummer Robert Dartsch, bassist Alain Goutier and keyboardist Charles Loos, which was released on the small plus label.

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