Most of them suck, because fighters usually have to listen to generic pop/rap/rock radio music in the gym, so they end up training listening to that crap and use it as a walkout cause it reminds them of training. Rarely do guys actually pick good, appropriate music for walking out to a cage fight. There's a shocking under use of metal, and I don't mean faux radio metal I mean death metal, the only guy I can think of is Josh Barnett coming out to Bolt Thrower. You can't tell me some rando pop song gets anyone more hyped than WAR METAL.