Andrew Neal has released a music app, which will soon be a part of CM9 as the official Music app for the firmware. While he is finalizing the name before making it available via Android Market, Neal has released the APK on his blog.
It can only be installed on devices running on Android 4.0+, which would include Galaxy Nexus, Nexus S, and other devices with early CM9 ports.
This app supports custom themes, gesture and motion controls, custom notifications, lock-screens as well as several widgets.
You can grab the download from Neal’s blog.