
Copyright protection
attaches as soon as you fix the song in a "tangible medium."
Though many folks are
still under the misapprehension that you have to register your work with
Copyright Office to "copyright" it, that hasn't
been true for decades. Generally speaking, if you scribble something on a sheet
of paper and then someone comes around and copies it, they've violated your
copyright in the scribble.
Copyright
in Vietnam
On the other...