Yeah, it was easy. I just had to rip a song into a playlist on my PS3 then I could select it as an entrance. No crowd noise though. Either it's disabled when you use non-game music, it's not in the game anyway or my custom "Adam Clark" wrestler is getting the reaction he deserves.
01/18 & 01/19 -- Godspeed You! Black Emperor and Neurosis (in Montreal)
02/08 -- Dark Tranquility
04/11 -- Black Sabbath
04/24 -- Nile