A Theme Tune which already existed as a well-known song. Most often, a cover of the original by an unknown artist is used, though use of the original is increasingly common. Tends to be more common for dramatic series, though it is not unheard of for the Sitcom. Rarely occurs in children's shows. In some cases the new version may become better-known than the original. In some rare cases it might blow the first popular version out of the water, leaving future generations to assume that the song hadn't been all that popular beforehand. See The Lone Ranger below for an example.