Copyright in music is used so that people have to ask publishers of the music if they can use it so that they do not get sued for using it without the permission of the creator. There are two different types of copyright in music copyright. The first being traditional which is a C in a circle which is to do with the composition, musical score, lyrics and artwork or cover designs all of which have copyrights of their own. The second being a copyright that applies to the sound recording itself which is showed as a P in a circle. Suppose you want to record and sell a version of a song and the composer has been dead for over 70 years the song is out of copyright and is available for for people to use in a public domain as long as the song has been performed and recorded by yourself. In order for people to use samples of music from creators they need to get permission before they use it and the easiest way to do this is to go to the last person you know who used it and ask them how they got permission.