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signature tune

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noun
  1. theme song(def 2).

Origin of signature tune

First recorded in 1930–35
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for signature tune

signature tune

noun
  1. British a melody used to introduce or identify a television or radio programme, a dance band, a performer, etcAlso called (esp US and Canadian): theme song
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012