A signature song is the one song (or, in some cases, one of a few songs) that a popular and well-established recording artist or band is most closely identified with or best known for, even if they have had success with a variety of other songs. There have also been instances where a film actor has acquired a signature song by giving a popular vocal performance in a feature. Signature songs can be the result of spontaneous public identification, or a marketing tool developed by the music industry to promote artists, sell their recordings, and develop a fan base.
Bands with a signature song often are expected to perform it at every concert appearance.
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... cable and satellite TV. Its logo, said to symbolize the human eye, and the signature tune, are nostalgically remembered even now by viewers who have moved on private channels and the web and OTT shows.