A Perfect Circle (often referred to as APC) was an alternative rock band, formed by guitarist Billy Howerdel. Howerdel had worked as a guitar tech for bands such as Nine Inch Nails, The Smashing Pumpkins, Fishbone and Tool. He played demos of his music to Tool's singer, Maynard James Keenan, who offered himself as vocalist should Howerdel ever form a band. Howerdel was initially hesitant about this as he originally wanted a female vocalist, but eventually agreed and A Perfect Circle was formed in 1999. To distinguish himself from his persona with Tool, Keenan wore long wigs on his otherwise bald scalp for all of A Perfect Circle's music videos, photo shoots and live performances.