Punk band formed in 1979 by Sidation (Flux of Pink Indians), Zillah Minx, Pete Fender & Gem Stone (Fatal Microbes) at a Crass gig at Conway Hall, London where Crass invited the audience to use their equipment.
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http://en.wikipedia.org/wiki/Rubella_Ballet
http://www.bbc.co.uk/radio1/johnpeel/artists/r/rubellaballet/