Thomas William Hamilton is an American musician and songwriter who serves as the bassist for the hard rock bands Aerosmith and Close Enemies. Hamilton has regularly co-written songs for Aerosmith, including two of the band's biggest successes: "Sweet Emotion" (1975) and "Janie's Got a Gun" (1989). Hamilton occasionally plays guitar, sings backing vocals and on rare occasions, lead vocals. He was a 2001 inductee in the Rock and Roll Hall of Fame as a member of Aerosmith.