I am going to suggest that this a wedding; notice the man sitting in a chair in the middle of the dancers? Music and dancing are a real part of the celebration!
"Chassidim," concluded the Baal Shem Tov, "are moved by the melody that issues forth from every creature in G-d's creation. If this makes them appear mad to those with less sensitive ears, should they therefore cease to dance?"
There are Chassidic musicians that use contemporary music, including rap, to transmit and encourage faith.
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