Forum Discussion
Free Music Sources for Educational Videos
That sounds like a fun idea! You might want to check out Uppbeat's sound library. I've used their music and sound effects in several e-learning projects and have been quite happy with them.
Not every file is free on that site, but there are a lot of free options.
EDIT: I originally had this in my post, but Judy brought up some excellent comments about the terms of service below. So I'm cutting this part out, but leaving it here so the thread makes sense.
"And if you do end up getting attached to a few of their paid options, a budget-friendly option is to subscribe for just a month, download the files you need, and then cancel your subscription before it renews for the next month. That said, it's a pretty cheap subscription if you end up wanting new sound effect and music files frequently."