I didnt mean to imply that Rav Moshe Assured listening to music at any time. Was trying to point out that listening to music at any time during the year is not such a clear cut issue overall.
Rav SB Cohens sefer DOES say that many poskim (it may even say most – but I dont remember) forbid listening to recorded music during the three weeks and goes so far as to say that a number of poskim even forbid listening to acapella (even SINGING is assur according to some poskim).
Of course, everyone should follow their own Rav, that goes without saying.