It seems that you're using an outdated browser. Some things may not work as they should (or don't work at all).
We suggest you upgrade newer and better browser like: Chrome, Firefox, Internet Explorer or Opera

I'm playing RF2 on Windows 7 and I can't hear any music during the levels. I can only hear the music at the main menu screen. Is there a way to fix this?
Odd, haven't had any issues here. Maybe reinstall? Or check in the settings that the game is using your audio driver?