Trevor Dunn is an American musician. His primary instrument is bass and double bass. Dunn has a degree in music, learning double bass at college. Dunn began playing bass as a teenager. In high school, Dunn formed Mr. Bungle with vocalist Mike Patton and guitarist Trey Spruance. Mr. Bungle's early compositions mixed thrash metal, hard rock, and funk with an air of adolescent humor and vulgarity.