Copyright is all about one thing.
It provides an official date of creation and who created it.

That said, the library of Congress is the registration that a court requires to bring a lawsuit.

With the internet and computers, everything posted online has data tagged to it that shows date of creation of that file. In addition to this, there are several companies that are providing a service that dates the files on secured servers. One such is the software company MasterWriter. It's a lyric writing package which includes a registration service.

One of the publishing companies I have dealt with that placed my music in films and TV, and yes, I got performance royalty checks for that from BMI, told me to not worry about copyright. They were handling that. And they did. For that reason, and others, I don't worry about the copyright for my music.

Yep.... I realize that this might ruffle the feathers of some in this business, but you are also free to do this any way that allows you to sleep restfully at night.

You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.