Music is copyrighted as soon as you present it in a fixed form. It doesn't matter whether that fixed form is written sheet music or a recording. Most people who copyright music do so for the extra legal protection. Even though a copyright is good to have, it is essentially worthless unless you've registered your copyright with the Library of Congress. You will need to fill out an application, pay a fee, and provide a copy of your music. As far as government dealings go, this is one of the least painful. Even the application fee is marginal when you consider the fact you are protecting potential future profits and royalties from your music.
Even if you aren't a talented performer, it doesn't mean your music will never be seen or heard, nor does it mean you should not bother copyrighting your music. One day you might find yourself more in demand for your talents than you ever dreamed possible. It is important to protect your music now more than ever before in history due to widespread music piracy and illegal music file-sharing.
Once you understand how to copyright music, you should copyright every sheet of music which you have produced. This involves registering each and every piece of music with the Library of Congress. Even if you must copyright one piece at a time until you manage to copyright all of them, it is much better to be safe than sorry should you ever go to trial in a copyright infringement case.
Copyright Music, Consecutive Notes, and Fair Use
Copyright music, consecutive notes, and lyrics are all covered under the blanket of copyright protection. Once you've registered your copyright you have legal recourse should someone steal or