Dropbox Music Player App is a fully functional dropbox musics player app for your phone.

Turn your dropbox into a personal cloud music player in seconds
User log in through dropbox
Automatically sync with dropbox, so if you remove files from dropbox, it will remove in the app also
Stream music files (mp3, m4a etc) from dropbox
Or download to your phone for offline listening
Playlist for all the mp3 or other common sound formats
You can control through control center