When it comes to “pikiach nefesh”, I wouldn’t start “clairing shailos”. But to answer your question, the statement was made in a shiur to all those in attendance.
By the way, as mentioned in another thread, Rav Moshe ZT”L held that music was assur all year long excluding for a seudas mitzva. However, he said, there is a heter now since we are nervous in today’s times and need music for the calming factor.