signature tune

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

主題曲, 片頭曲

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.
管弦樂隊在幕布升起時演奏了節目的主題曲
Every morning, the radio station starts with its familiar signature tune.
每天早上,廣播電台都以其熟悉的主題曲開始。