Casey Chaos (born Karim Chmielinski; October 9, 1969) is an American singer/songwriter, musician, and artist.Chaos's music has encompassed a number of styles over the years, including hardcore punk, death rock, metal. He is the songwriter and vocalist of the band Amen.In 2006, Casey Chaos received a Grammy Award Certificate for co-writing "B.Y.O.B." for the band System of a Down.