Copyright is one of the topics that I always cover in my webinars and workshops about making videos with students. The subtopic under copyright that many students struggle to understand is how copyright affects the music they can or cannot include in their video projects. That confusion is often rooted in the idea that someone has purchased music through iTunes or Google Play so they think that gives them a license to reuse it. The truth is that purchasing music through one of those services gives you a license for personal use but not for reuse. If you want to give your students a good representation of this concept, show them the screen that loads when you try to download a song on Jamendo.
If you are looking for music that you can reuse for free, check out Dig CC Mixter.