Deep Purple is an English rock band formed in London in 1968. They are considered to be among the pioneers of heavy metal and modern hard rock music, but their musical style has changed over the course of its existence. Originally formed as a psychedelic and progressive rock band, they shifted to a heavier sound with their 1970 album Deep Purple in Rock. Deep Purple, together with Led Zeppelin and Black Sabbath, have been referred to as the "unholy trinity of British hard rock and heavy metal in the early to mid-seventies".
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