The Free Music Archive
You can visit the home and search page for the Free Music Archive here: https://freemusicarchive.org/static
Its rights and permission statement may be found here: https://freemusicarchive.org/Terms_of_Use
The Free Music Archive consists of MP3 files submitted by individual musicians who wish to share their materials freely for use by others. Material on the site is licensed via a Creative Commons Attribution-Noncommercial-Share Alike 3.0 License. Because it relies on member-generated content, the archive offers a wide variety of material in a number of different genres, with varying audio and performance quality. By offering this material through a “share alike” license, any new material created that uses material from the Free Music Archive must also be given a share-alike license and be open to the same type of creative reuse.