Hi Gary,
Copyright law is pretty complex. It is true that a copyright is created the moment a creative work is "reduced to tangible form" (the term used in the Law itself). For music, that would be when the song is played AND recorded, or the notation (or words to a song) written down. For photos and almost all written works, it is at the time of first writing, regardless of whether it is technically "published" in book or any similar form. It could be handwritten.
The points I mention about getting the copyright filed with the US Government Copyright office, has to do with whether or not you will be able to enforce an injunction (meaning stop distribution of a stolen work prior to a full trial of facts) and also whether you can collect punitive damages. "Actual damages" are often non-existent.
Intellectual property lawyers who handle infringement practice in an expensive specialty, around $250 - 400 per hour (I know, I've hired them!).
There is a site called
www.findlaw.com which has just tons of info on all aspects of the law.
The site I like better is
www.gigalaw.com, which deals more with intellectual property, with a heavy dose of Internet related cases & info.
I don't think an effort to establish a claim by mailing a copy to oneself has any meaning, especially if another person had actually filed and held an issued copyright on that material. Thirty five dollars is not much, for the protection you get. If you value your creative work, I advise all creative artists to apply for the actual copyrights --- good for your life, plus seventy years. An instant estate! Have fun!
BTW, I love bluegrass music, but admit to being pretty ignorant beyond Vince Gill and Bill Monroe. Care to give me your list of say the All Time Top 10 Bluegrass bands/performers? I'd like to expand my library.
All the best,