N-COUNT (电视、广播节目的)信号曲，开始曲，结束曲;(某演奏者为人熟知的)金曲，代表曲 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. (电视、广播节目的)信号曲，开始曲，结束曲;(某演奏者为人熟知的)金曲，代表曲 [mainly British]
Doesn't that sound like the signature tune from The Late Late Show?