Great suggestion, but I'm indeed worried by copyrights.
I also have a huge collection of mp3's with in-game pinball music (and I have permission from the person ripping them to publish) but I don't think I'm allowed to put these on the site since they are technically still copyrighted by someone (Planetary Pinball, I presume, in the case of BLY/WMS?).
If any of you are lawyers and want to help me find out what is and what isn't possible I would be happy to add music and/or sound bytes to the site. But I can't risk putting the site in danger because of them (as you can imagine) and I have zero knowledge when it comes to copyrights.
I can't do this based on assumptions, I need feedback from someone who knows what he's talking about (a lawyer probably).