PBS has a hit on its hands with the British import “Downton Abbey.” Set at the start of World War I, the drama’s Jan. 8 season premiere doubled the average prime time audience for the network. We discuss why the former colonies seem to love a soap opera about the Earl of Grantham, his family and his servants with John Lunn, who composed the show’s iconic theme music.

New Classical Tracks: The Music of Downton Abbey