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, with Josh Freese being the band's primary drummer after the band's initial round of touring prior to their first album. The latest lineup features Puscifer and Ashes Divide bassist Matt McJunkins; former The Smashing Pumpkins guitarist James Iha; and Puscifer and Ashes Divide touring drummer Jeff Friedl. 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 and melodies.
A Perfect Circle has released three albums: Mer de Noms (2000), Thirteenth Step (2003) and Emotive (2004). A CD-DVD set, Amotion, was released alongside Emotive released and contains thirteen music videos in addition to a number of song remixes created by Danny Lohner, Robert Del Naja and other artists.
The band went into hiatus in 2004. Since then band members have worked on other projects, the most notable being Keenan's work on Tool's 2006 album 10,000 Days and Howerdel's album Keep Telling Myself It's Alright under Ashes Divide, his name for his solo work. The two announced they had reformed to work on new material in late 2008, although the band was not publicly active until 2010, when the band began touring again.
On November 19, 2013, the band released a greatest hits album entitled Three Sixty, which contains one new song, "By and Down", and on November 26, 2013, the band released a box set entitled A Perfect Circle Live: Featuring Stone and Echo. While the band continues to work on new material since its reformation, few details exist regarding a timetable or form of the release.