Apparently if you listen to Pink Floyd's Dark Side of the Moon, and watch The Wizard of Oz, they sync up perfectly. I have a hard time believing that, but apparently Metal act Last Chance to Reason have finished a concept album called 'Level 2'. The concept? They've created music designed to play in sync with a flash game designed in parallel with the album.
Now I'll be perfectly honest - I hate Metal music with a passion, but even I think this is a pretty interesting idea. There's a preview vid above, but you can also download a preview of the game itself here.
Thanks to Dan for the tip.