Grumpy Zombie
Newbie
Replace it using es file explorer (with root enables and system mounted as read/ write) or root explorer (paid app though), and replace the music.apk in /system/app and reboot or replace it in the .zip and flash.
EDIT: Alright so I did that, and now when I try to open it all I get is an error message saying "unfortunately, music has stopped"
Did I do something wrong? I removed the old music apk and put in this one.. should I have left them together?