signature tune

US /ˈsɪɡ.nə.tʃər ˌtuːn/
UK /ˈsɪɡ.nə.tʃər ˌtuːn/
"signature tune" picture
1.

thème musical, indicatif

a tune or song that is regularly used to introduce a particular television or radio program, or a performer or group

:
The orchestra played the show's signature tune as the curtain rose.
L'orchestre a joué le thème musical du spectacle au lever du rideau.
Every morning, the radio station starts with its familiar signature tune.
Chaque matin, la station de radio commence avec sa chanson thème familière.