Thanks to dosluke for grammatical corrections!!

Recommand enable "Auto Update" in android market.

If an error occurs, report, or device and the version you are using, send an email with the error information will help to improve
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Plug In Music Widget provides the following functions:
1 set number of music played, then music player automatically stop the playing
2 insert earphones and a music player automatically start to play music.
3 When you insert an earphone, set to automatically adjust the volume.
4 If you disconnect the headphones to play music continuously or can be stopped
5 Isolating Earphone set to automatically adjust the volume.
6 set time of music played, then music player automatically stops the playback of
7 as the default Music Player
8 using the volume key when the screen is off, the next / previous track to go
9 you can select transparent background, or background

Softwarelint reviewed this app!!
http://softwarelint.com/android/best-android-music-widget