Let's make it short. I bring you stock Xperia Go Music Player with full Equalizer, ClearBass, Headphone Surround and Edit music info support.
I couldn't get "download music info" to work so far but tell me if it works for you.
Simply flash via CWM recovery.
It's always a good idea to make a nandroid backup first. I'm not responsible if you lose any of your data or damage your phone by flashing this file.
Gustavo RD78 for sharing xperia go system folder.