This is a custom build of the KitKat (Android 4.4) AOSP music app. It should work on most android phones and tablets running Android 2.3 and higher. It's ad free and I have no intentions of changing that

There are a couple of modifications:
* The notification is clearer and has the album art visible on it
* The lockscreen shows the default album art if there's no album art found for a song

I'll be changing some other stuff eventually :)

Source code from the Android Project found here:
http://android.googlesource.com/platform/packages/apps/Music.git