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For clarification, any part of the song you hear and recognize puts you out? Like if a radio show has a cut in the background as their intro bed, that's enough?
I think there was a ruling that if you only hear the opening note but turn it off before she gets to “for Christmas” - you’re still good. Or if the version you hear goes straight to the piano part, you’re still good to turn it off before the vocal starts.
@Bleu Raeder to confirm