You would lose most of the beauty of the music, but you could generate and broadcast DTMF touch-tones instead. This would be less susceptable to interference on the receiving end, and could also be decoded with different types of hardware not limited to the computer. It may (or may not) play into your friends story better...

I think your code is way cool and would love to listen to some "classic" chess matches like Botvinnik vs Fischer. Would Kasparov vs DeepBlue sound different than a human player?

You could really see this project take off if you targetted the recent podcasting craze. There would certainly be an audience of people that would be interested in broadcasts/podcasts of different matches.