"A recording of R' AY Soloveitchik and his brothers and nephews singing Hamavdil after the Sheva Brochos of one of his sons (In the old Eitz Chaim Cheider on "Yaffa Gass".) Any one who attended any of them should remember it well. They all stand together with the oilam surrounding them and they sing it with great dveikus. The niggun is (as they say over) a Kotzker niggun. As is well known, R' Berel had a melamed who was a Kotzker chossid, and he taught him this as a child. (Notice the "A gitte voch" at the end in the Polish accent) As far as I recall, R' AY and family sing it on Motzai Yom Kippur and by simchos."
Click here to download