you may wish to munsch make a written agreement stating. There will exist a joint ownership of copyright. Proof of Copyright Apart from registering your copyright with Copyright House, the agreement should ideally be signed in the presence of a legal professional, you should always keep copies of demos and biotech proofs of posting of your music to record companies and music publishers. Agreements between band members If you are a member of a band and your songs or music are written collaboratively, such as. This statement should include what happens to the music copyright if case one of the members leaves or if the band breaks up.