According to Wikipedia:
Mr. Bungle was a musical group that fused elements of heavy metal, rock music, ska, free jazz, pop, contemporary art music, and many other musical styles, often within a single track.
the signer is mike patton (faith no more). great stuff, but not usual (but hey, it's mike patton), going from free jazz to death metal in 1 second, it's really something... saw them once in concert, really great...