Interesting choice... the band Chicago were originally known as the Chicago Transit Authority, and were forced to change their name for legal reasons. In their early days they had a much-harder hitting experimental sound than the later Chicago pop hits, and Terry Kath was highly rated as a guitarist by Jimi Hendrix!
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U - (Ian) Underwood . Woodwind and keyboard player for the Mothers of Invention, and a key contributor to their distinctive sound. Also often appears on other Frank Zappa albums and collaborative projects.