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In Israel it is customary to sing a wordless niggun after a mazel tov is read out in shul. (The only rendition I could find is here, excuse the cats). Where is this niggun from? Who wrote it?
@פרי זהב answered this -- it's a Gerrer niggun, as sung here by Yitzchak Meir: https://www.youtube.com/watch?v=ernnuEpDim0