Also, Rav Moshe (here) is discussing live music, not taped.
The words you quoted from R’ Moshe were badly botched up by OCR. The actual words, “??”? ????? ?? ???? ???? ????? ???? ??? ???? ??? ????” would imply that recorded instrumental music is ????. (I’m assuming that the radio he refers to was playing recorded music, or that even if it was live, being heard over the radio would have the same ??? as recorded music.