A Perfect Circle is a supergroup.
A Perfect Circle is an American rock supergroup formed in 1999 by guitarist Billy Howerdel and Tool vocalist Maynard James Keenan . A Perfect Circle has released three albums : their debut Mer de Noms in 2000 , a follow up , Thirteenth Step in 2003 , and an album of cover songs titled Emotive in 2004 . Emotive ( stylized as eMOTIVe ) is the third album by American rock supergroup A Perfect Circle .