Music8 is a new mp3 music player wich can read your local mp3’s. This player bring you more advanced option than the stock player…and it’s a paid application (0.99$) with free trial (trial don’t have advanced options). The entire app have been recently UI updated to be more “Metro” and provide a better experience.
Here is a list of some functions :
The app is compatible with WP7/WP8 and a WP8 version with lockscreen support is currently in beta test. Find it in the Windows Phone Store here for $0.99.