I was very encouraged to find this website (lessonplanet.com) which lists over 60 lessons involving music with Project Based Learning. I will definitely check this site out more carefully in the near future.
I've found that students enjoy the idea of creating their own games so why not turn it into a more meaningful lesson tied to CCSS and 21st Century learning skills?
I liked this website because it had a bank of several projects that covered a wide variety of topics. There aren't that many, but the ones that are on here are pretty detailed and come with a lot of resources.