That makes sense. I didn't know it either. What section of Copyright Law, 17 USC, covers that subject?
Beats the hell out of me. My knowledge on the subject is much more mundane and practical. Because of sales events where I purchased music rights for my former employer, I do have access to all of BMI's forms and schedules to determine cost. Master use licenses aren't even on the map. The only way to acquire a master use license is have your attorney call their attorney...and blah blah blah, pay pay pay.