Audio [Q] How to turn my phone into a dedicated MP3 player

I have an old Epic 4g Touch laying around and it can have a pretty large amount of storage in combination with my 16gb micro sd and I've been wanting an Mp3 player lately, so naturally I got this idea. Figured I can just get rid of all the bloatware and have it in airplane mode all the time. So basically I don't have much experience with all of this ROM and rooting business. I did manage to root my device following this tutorial:

So now I'm rooted and have ROM manager on my phone from the Play Store and now I don't really know where to go from here. I would like to have just a really simple interface with some really nice lock screen music controls and what-not. So if anyone could just point me in the right directions that would be great.