Ok I know I've been at this for a while But I'm just fed up with it

I have problems With the Music PRX

I have some music in MP4 format, 5.00m33-6 CFW,and The music PRX yet it won't run for me
Can anyone help me? I really hate the music they put into games these days so I wanna listen to my own while I'm playing SFCO and the such.