I was viewing a 5-minute clip by the University of Maryland’s Art History program and at the end they gave credits for six pieces of music they had used. Digging a little deeper, I found the site called freemusicarchive.org. Their music is by musicians all over the world, and the archive is huge ( eg. 10,000 folk pieces alone ).
Here’s part of their blurb on “About”:
The Free Music Archive is an interactive library of high-quality, legal audio downloads directed by WFMU, the most renowned freeform radio station in America. Radio has always offered the public free access to new music. The Free Music Archive is a continuation of that purpose, designed for the age of the internet. It was launched in 2009.
This image gives some idea of the breadth of their offerings: