Im trying to release a beat mixtape with about with 12 to 14 beats to promote me as a producer. Hand them out free of charge. Lets say someone is interested in buying one of the beats off the mixtape. What I wanna know, is it best for me to have copyrights for my beats before I promote them if so how do I go about it? And would I have to copyright the mixtape as whole? I'd really appreciate some advice and insight.