In college, he directed the collegiate a cappella group the Tufts Beelzebubs, transforming the group's sound to reflect modern rock, with intricate instrumental vocalizations and the integration of vocal percussion. The 1990–1991 Beelzebubs album Foster Street that he directed musically is credited with the creation of contemporary a cappella sound. Sharon had to audition three times before he was accepted, as he was seen as "overzealous" during a time when a cappella was not popular, a fact which was mentioned in the book "Pitch Perfect." Beca and Benji in the Pitch Perfect films are partially based on Sharon. During this time, he decided to make a career of contemporary a cappella.
