Maynard James Keenan is a singer.
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 . Maynard James Keenan is best known as the lead singer of rock bands Tool , with whom he has recorded four studio albums and earned two Grammy Awards , and A Perfect Circle , with whom he has recorded three studio albums .