It's not only Spotify. I've had the same issue with Adium notification sounds while the game was running in Safari on OS X 10.9. Funny, the sound became all 8-

It's not only Spotify. I've had the same issue with Adium notification sounds while the game was running in Safari on OS X 10.9. Funny, the sound became all 8-bit like, so it fitted the game quite nicely. :)