A Perfect Circle was an alternative rock supergroup, formed by guitarist Billy Howerdel. Howerdel had worked as a guitar tech for bands such as Nine Inch Nails, The Smashing Pumpkins, Fishbone and Tool. He played demos of his music to Tool's singer, Maynard James Keenan, who offered himself as vocalist should Howerdel ever form a band. Howerdel was initially hesitant about this as he originally wanted a female vocalist, but eventually agreed and A Perfect Circle was formed in 1999.
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