Reply To: music lag ba’omer night or not??

RBZS, so you do know the answer. Witnessing Rav’s behavior is one of the major ways to learn the halakha. It is a wrong idea that learning have to be from books, it is preferred to learn it from T’Ch – unless you suspect that R Moshe was under duress, or it was a wedding of a princess, or R Moshe (H’V) is disqualified by the virtue of having a bas going to college, or a bas bito learning Gemora L’A.