If you haven't read this article, please do so while you are downloading the Honeycomb music player that I've confirmed is working on the Epic. Unzip and launch apk.
It's still in beta. But after several hours of testing, it seems to be running without problems on my Epic 4G. Current limitations: doesn't appear to have the 5.1ch in the stock Froyo player, lacks detailed settings/options, and there is some navigation limitations.
I'm running Midnight ROM 5.2 BYOR with Journaling On, with Twilight 1.1 Kernal.