B"H
From chabad.org:
This is one of the more serious of the Chabad melodies, characterized by its deep feeling and soul searching expression. The Rebbe "Rashab" was fond of this melody and sang it often. During World-War I, he left his native city of Lubavitch and settled in (in southern Russia), where he resided until his passing in 5680 (1920). It is therefore known as the Rostover Nigun - melody. The melody is usually sung before the Rebbe began his Torah or Chassidic discourses.
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