I trained as a classical pianist. Of course, it is hard for many musicians to accept that they have diminished hearing. That's understandable.
Here's a site that is not afraid of discussing this openly:
http://www.hearinglossweb.com/Medical/Causes/nihl/mus/mus.htm
High volume diminishes hearing. This is a widely accepted fact. Oooops. No facts, ma'am. Remember Dragnet? Jack Webb should have said IMHO. But that was in the era before everything had to be politically correct i.e. self-censored.
I have been wearing wax ear plugs (when needed) for the past 35 years and I'm very glad about it. Unfortunately, I forgot them for a Smokey Robinson concert back in the 1980's. I had to walk out because of the high volume. Because I have protected my hearing I am now able to enjoy all the subtleties of the high frequencies -- unlike many of my friends who did to take this simple precaution when attending concerts and who now find themselves hearing pianos instead of triangles.