A signature tune is the tune which is always played at the beginning or end of a particular television or radio programme, or which people associate with a particular performer.
[mainly British]
Doesn't that sound like the signature tune from Doctor Who?
Darts takes the showbusiness thing seriously, with the players entering the arenato their own signature tunes.
regional note: in AM, usually use theme song
signature tune in British English
noun
British
a melody used to introduce or identify a television or radio programme, a dance band, a performer, etc
Also called (esp US and Canadian): theme song
Examples of 'signature tune' in a sentence
signature tune
Old radio signature tunes and royal music are on the agenda.