Billy Howerdel is best known as the songwriter and guitarist for A Perfect Circle, the band he created with his good friend James Maynard Keenan (Tool / Puscifer) after they met when Tool were supporting Fishbone for whom Howerdel was a guitar tech in the early nineties, before sharing a house together in the Hollywood Hills. Howerdel would work on his early material while also engineering for the likes of David Bowie, Guns n’ Roses, and Nine Inch Nails.