The late '70s was a time that had already seen a number of American fusion groups ?? including John McLaughlin's first incarnation of Mahavishnu Orchestra, various versions of Chick Corea's Return to Forever, and Herbie Hancock's Headhunters??implode, to some extent as a result of their own self-indulgence and egos; and the emergence of punk in the UK signalled the beginning of the end to a larger