Thomas William "Tom" Hamilton (born December 31, 1951 in Colorado, United States) is an American musician, best known as the bassist of hard rock band Aerosmith. He has co-written two of Aerosmith's hits, "Sweet Emotion" and "Janie's Got a Gun". Hamilton occasionally plays guitar (e.g. "Uncle Salty") and sings backing vocals (e.g. "Love in an Elevator").