If you are wondering about Copyright you should read this article.
According to Bmi.com, "Do not confuse acquiring a copyright with registering your claim to copyright. You acquire copyright (legal protection of the law) automatically when your work is “created,” which is defined as being “fixed” in a copy or recording for the first time. For example, the moment that you lift your pen off the finished lead sheet or turn off your PDA after saving your composition, the song is deemed “created” and the copyright begins."
© 1994-2014 BMI