I'm waiting for somebody to jump in with the "don't criticize it if you haven't tried it" response.
Personally, it wouldn't surprise me if some music sounded 'better' when tuned to a different frequency, whether it is up or down. I remember hearing a clip of what I think was a female vocalist played at something like half speed. It sounded like a male, and it also sounded real good.
As for tuning A to a different frequency, isn't that like telling everybody to just play in a different key?
bs