A Perfect Circle is an American rock supergroup formed in 1999 by guitarist Billy Howerdel and Tool vocalist Maynard James Keenan. The original incarnation of the band also included Paz Lenchantin on bass, Troy Van Leeuwen on guitar, and Tim Alexander on drums. The latest line-up features Puscifer and Ashes Divide live bassist Matt McJunkins, former guitarist for The Smashing Pumpkins, James Iha; and session drummer Josh Freese, who is best known for his work with Nine Inch Nails, Devo, and The Vandals. Despite having a varied cast since inception, the stylistic content of the songs has remained consistent with Howerdel as composer, and Keenan penning the lyrics.
A Perfect Circle has released three albums: Mer de Noms, Thirteenth Step and eMOTIVe. A CD-DVD set, aMOTION, has also been released and contains thirteen music videos in addition to a number of song remixes created by Danny Lohner.