Claim: Maynard James Keenan is the lead guitarist of a rock supergroup.
Evidence: Maynard James Keenan -LRB- born James Herbert Keenan ; April 17 , 1964 -RRB- , 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.