I don't know whether you are mixed with overseas underworld or mainland underworld. If you belong to the overseas underworld, there is a rap genre called Gangsta Rap. If used in the underworld, proper clothing and posture will be very west coast! The underworld in the mainland, I think, has no musical literacy at all. At best, just put on some dirty disco music. The two brothers can't appreciate the lyrics and carefully arranged music. Think about it. Brothers beat the blind, scold the dumb, kick widows' doors and dig homeless graves every day. Where can they stand the influence of literature and art?