I'd rather frame it in a different way for myself: some rigidity in preferred genre's has set in. Judging some newer genre's is just... outside of my scope now, and instead of it feeling less or lower then 'peak', it's more a problem of my (music)bagage getting in the way. That, plus there is SO much music being pumped out, that statistically, if you feel the better music times are behind us, it's way more probable that you just havent found the new music that you love yet.

The daily genre class sounds fantastic, chances are high that she will find loads of new music interests in a small amount of time and effort. Gotta love it.