I Hate the Music
Dear Duolingo, the music in Duolingo is the most annoying thing ever. It's okay by itself but I cannot find the "off" button and it muffles the voice. I'm not sure if it's in Duolingo or just playing on my iMac for some reason, but if it's Duolingo's fault then I sort of hate it. Just make it easy to access the "off" button. Pleeeeeeease.
Yeah, Skye07 has a point. You could have some kind of malware. If you don't have a good virus scanner, you can use Avira Free Antivirus - it's completely free, and can protect your computer in real-time.
If you want to get it, be sure you get the free version:
I strongly suggest restarting the computer and clearing your cookies, as well. Make sure you don't have any other tabs open that could be causing the problem.
If you still can't get rid of the music, either have a computer expert look at it, or let me know. I might be able to find a different solution.