theme songtheme song
- a recurring song or melody in a film, musical, etc.; esp., such a song or melody intended to be identified with the work as a whole
- an identifying song or melody used by a dance band, singer, etc. or for a radio or television series; signature
- An often repeated song in a musical play that is identified with the work or one of its characters.
- A song that is identified with a performer, group, or radio or television program.