Bradley Joseph "Brad" Breeck is an American former songwriter and was the series composer for Gravity Falls. Among the many pieces of music he wrote for the show are the theme song, "Disco Girl," and "Don't Start Un-Believing." He has written various songs for many campaigns and programs, including Nickelodeon, Cartoon Network's We Bare Bears, Disney TV, BBC, and MTV. The shows he composed for include Fanboy & Chum Chum and Awkward.