Also known as chorus, refrain in poetry
thumb|Musical notation for the chorus of "Jingle Bells"
A refrain is a section of music or lyrics that repeats at intervals throughout a song, like the "chorus" in modern music. It matters because it creates a memorable, unifying element that listeners recognize and can sing along with, making a song more engaging and easier to remember.
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).