Rock in Opposition

Wikipedia - "Rock in Opposition or RIO was a movement representing a collective of progressive bands in the late 1970s united in their opposition to the music industry that refused to recognise their music. It was initiated by English avant-rock group Henry Cow in March 1978 when they invited four mainland European groups to come to London and perform in a festival called 'Rock in Opposition'."
Wikipedia, Rock in Opposition, CHAMBER MUSIC ROCK, Bukisa, YouTube, (1), (2), (3), (4)