Copyright is common law; if you are the author, any proof will do,
however Copyright Registration at Library of Congress(Madison Bldg.
1rst and C SW Entrance, 2nd Flr) is still your best witness. It is
so easy, and they will help you. All you need is a cassette of
your "stuff" and 20$(unless they changed the price) It costs the
same to register 1 song or several in one compilation. If you live
in this area, you have it made, 'cause it is right on the "Hill".
Lawyers charge substantially to "handle" this for artists in other
cities. Take advantage.
Regards to all,