Omen is a popular band/artist/production name in the music world. There are at least 7 artists/groups which use that name. (Discogs lists as many as 11 (eleven) different artists/groups.) They span the gamut from rock music to metal to edm. 1. OMEN is an American Heavy Metal band that was formed in Los Angeles in 1983 by guitarist Kenny Powell, as he left the band Savage Grace. Omen is best-known for melodic yet aggressive power metal/fantasy metal along the lines of King Diamond