Audiology Online provides continuing professional education for hearing care providers (CEU’s required to maintain certification, information to understand new models of HA’s and their fitting, etc. If you search their offerings on “music” (without the quotes), there are quite a few hits. The one that seemed most relevant to the discussion in this thread is the following:
The course description reads in part:
This study describes music sound quality ratings between the universal and music programs of five premier market hearing aids, and which hearing aid achieves the best overall sound quality ratings.
I don’t know that there are any restrictions on someone associated with an OEM touting the usual “whitepaper” assertions without peer-reviewed and accepted evidence, so I would take claims in any course with a grain of salt (or two). But Audiology Online might be a good place to go to get more professional knowledge (and opinions) on hearing aids and how they deal with different sounds, music vs. speech, etc. You can sign up for a free account and audit courses for free. You only pay for a course if you want to claim CEU credit.
There are also Audiology Online courses on how to protect the hearing of musicians (and music listeners) while still allowing music appreciation. And one course that I saw on “Why We Like Our Music Loud!”