HarryFox Agency - contains tools for calculating compulsory licenses ("royalty licenses explained"), licensing cover songs, and licensing songs for videos. "A cover version or cover song, or simply cover, is a new performance or recording of a previously recorded, commercially released song by someone other than the original artist or composer." Cover version, Wikipedia (2016). Rather than compulsory licenses under 17 USC § 115, "Harry Fox agency has emerged as the private commercial entity that grants mechanical reproduction licenses, collects and distributes royalties, and enforces copyright infringement claims." Alfred C. Yen & Joseph P. Liu, Copyright Law 323 (2016 3rd ed.). Section 115 continues to act as a ceiling on royalty rates.