A Perfect Circle is an American band formed in 1999, in Los Angeles, California. The band, often referred as a supergroup, consists of guitarist Billy Howerdel, Tool vocalist Maynard James Keenan, James Iha from Smashing Pumpkins, Matt McJunkins and Jeff Friedl. The band released three studio albuns until entering a hiatus in 2004. They then returned in 2010. A Perfect Circle has been widely hailed as a major influence in Modern Rock.