If you have a Mac, I'm pretty sure you can use Garage Band for this. You can import the video to Garage Band by dragging the video's icon into the project screen. Then, you can edit the audio (or not), and export it to itunes. If you live near an Apple store, you can go to one of their free classes and they'll show you exactly what to do. Of course, you'll get way more information than you're after. . .but maybe you'll end up writing a hit song while you're at it
. Good luck!