Welcome to the site. :)

Originally Posted by: YitbirdJust wanted to know what is the best way to copyright a tune before getting out there so you don't have it highjacked?

http://www.copyright.gov/register/

You can also use the "old school poor man's copyright": send yourself a registered mail copy of your tune(s). The postmark on an unopened mailing has been used as legal proof of original copyright status. But if you are serious, then go with the Library Of Congress link above. That is the only legally authentic holder of copyrights in the US.

Have fun!