A Perfect Circle was formed by an American.
A Perfect Circle is an American rock supergroup formed in 1999 by guitarist Billy Howerdel and Tool vocalist Maynard James Keenan . Maynard James Keenan ( born James Herbert Keenan ; April 17 , 1964 ) , often referred to by his initials MJK , is an American musician , record producer , winemaker , and actor , best known as the vocalist for Grammy Award-winning progressive metal band Tool .