[Musicman247]

There's a much, much simpler way. In fact, it's built into the Windows Media program!

Start playing a song

Tap Menu, then Options...

Tap the right arrow until you can see the "Buttons" Tab

tap the "Buttons" tab and scroll down to the very bottom of the list

The very last option is to turn the screen off. Assign a button to it and then you can turn your screen off while music is playing on Windows Media Player.