There are several artists with this name: 1) Ultra (also recording as Rider) is also an English pop band, which was most successful in the late 1990s. 2) Ultra is a hip-hop superduo consisting of NYC rappers Kool Keith and Tim Dog. 3) Experimental/noise US outfit Ultra (R. Stanford King, Wesley Mark, Jon Carlson), who creates deeply anxious collages of sound and voice in a mixture of fear and beauty.