Playing Background Music
To play background music (MP3 files) that you have transferred to your Kindle, follow the steps below:
1.If you are not already on the Home screen, press the Home key.
2.Scroll to the Menu selection, and press the select wheel.
3.Select "Experimental" from the menu.
4.Select "Play Music" on the screen shown.
To turn off background music playback, select "Stop Music" from the "Experimental" screen or the Experimental or Home menu while music is playing. You can also play or stop background music
playback by holding down the ALT key 
and pressing the P key or you can forward to the next
track by pressing the ALT key 
and pressing the F key.
When you play background music, it plays until you select "Stop Music" from the menu, until all of the files have been played, or until you open an audiobook. The song order automatically shuffles among all the MP3 files you have in the "music" folder in your Kindle or an inserted SD memory card. You can adjust the volume of the music using the physical buttons at the bottom of your Kindle.
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