sting

musical cue

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In radio: Radio music
“Stings” were musical cues that came in sharply and dramatically, often played just after an actor had delivered a line indicating a new turn in the story line. Many radio shows also had distinctive theme songs; some of them became indelibly associated with particular performers.
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In radio: Horror and suspense
…the most uninhibited pipe-organ “stings” in the history of radio. The show’s best-remembered trademark was the ominous squeaking, creaking door that opened each episode and slammed shut at the episode’s conclusion.
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