Here is the complete daily lesson as delivered by The Rav, Rabbi Eliezer Berland shlit"a, last night—Sunday night, the eve of the 20th of Av, Parshas Re’eh—after Ma’ariv:

“Serach bas Asher would do nothing but dance all day—she didn’t stop dancing for even a second. And therefore, the Aseres HaDibros correspond to the ten types of melody: only someone who dances all day and plays music all day will merit to hear the Aseres HaDibros anew.”

To watch the replay of last night’s Ma’ariv—filled with singing and nigunim—the lesson begins at 33:33