Click on a piano key and hear some music. It's that simple and easy to use. You don't control the music, but at least you get to hear some good tunes without having to register anything. Turn off the music by clicking on the cute little demon's nose. The code is on the widget's website towards the bottom.

Here's a wacky widget for you: a funky one-eyed thing dancing around to music with a guitar in it's hands. Just press the Play Song button. The code is on the widget's web page, a blog, on the right side. Can't miss it.