Formed by Tool vocalist Maynard James Keenan and former Tool guitar tech Billy Howerdel, A Perfect Circle is an extension of the alt-metal-fused-with-art rock style popularized by Tool in the early to mid-'90s. While similar to Tool in intensity and melancholy, A Perfect Circle is less dark and more melodic, with a theatrical, ambient quality that incorporates occasional strings and unusual instrumentation.
As of 2006, A Perfect Circle is currently on permenant hiatus until further notice. Billy Howerdel is currently working and creating music for a new band that is yet untitled and may include Freese and Troy but Maynard will definatly not be present.