Law Office of Bert W Gieseman Jr | Albert W. Gieseman Jr.
You own the copyright upon the creation of your work (song). I recommend to my clients that they register their copyrights with the US Copyright Office, especially if they plan to record, circulate or otherwise use their copyrights.
Answer Applies to: Illinois
Law Offices of Juan Dotson | Juan Dotson
It depends. Do you want the whole world to know you wrote this song? Generally yes. Do you only want the money? Generally no. If your plans are to give your music away free, you do not need to copyright your work. You do not need to speak to an attorney. If you are giving your music or ideas to anyone in the entertainment industry for any other reason, you should first talk to an attorney.
Answer Applies to: California