MediaMonkey for Android
MediaMonkey for Android provides much of the advanced media management functionality that users expect of MediaMonkey products. Used in conjunction with MediaMonkey for Windows, it shares your media library and most of its attributes between your desktop and devices. Whether you edit metadata (including multiple attributes per field), playlists, ratings, play history, bookmarks, etc. on your desktop or Android device, you'll have a single consistent view of your media collection.
Of course it's also a full-fledged media player, with support for music, video, podcasts, etc., volume leveling, equalizer, sleep timer, UPnP/DLNA, and more...
To learn more, check out the MediaMonkey for Android Wiki.