Scroll your mouse over the steps of the DNA double helix. Keep the mouse where the arrow becomes a pointer indicating something is there. You will hear sound and usually see an image. These are really short edits of larger pieces.
The top step is not yet filled. The steps are color coded. Bring the cursor to My Musical DNA to stop a sound with thunder. Click on some of the steps to see a larger image with more information. Once you activate the Cage (down under), you can overlay other music on top of it.