Watch Rabbi Simon Jacobson enthrall the crowd with an impassioned talk about the majesty and relevance of Chassidus in our lives at a 19 Kislev banquet in Buenos Aires, Argentina. At one poignant moment, in the midst of discussing the power of a Chassidic melody to penetrate the heart and soul, Rabbi Jacobson began to sing a stirring Yom Kippur niggun and the entire audience—a roomful of 800 people—spontaneously joined in, united and uplifted in song despite their language barriers.