Sonos Widget is a widget for your Sonos system.

SongDNA: Your source for song information: tourdates, shows, tweets, videos, and much more!

RockOn is a music player for Android. It has a nice all-graphic UI interface, location-aware concert info and automatic album art. It is the player of choice if you prefer browsing your music library by album art.

Music player with clean interface, equalizer, bass boost and customizable colors

Shake Player is an application under Android 2.2 platform. This application can be used to created a simple media player. But isn't a simple one, this application is using a shake button and shake your device.