The most common type of copyright infringement occurs where a commercially available song is, or seems to be, very similar to another pre-existing song. In order to sue for infringement here, the original writer must show three things: (1) ownership of the song infringed upon, (2) the infringer had "access" to the original song, and (3) "substantial similarity" between the two works. Infringement can also occur when someone uses a song without permission/license and when a record is "pirated" or "bootlegged". www.benmclane.com