Interesting and challenging thread here.

So far as the topic of a catagory for gay music, I don't see the potential response to it as "all hell breaking loose", rather I see the response being "What the f*#@ is this catagory here for?"
The only motivation can be political, a matter of personal politics. I don't see it as a valid way to classify music.

I could write a list which would probably require several pages of all the gay artists I enjoy, yet I don't happen to be concerned about the fact they are gay. My enjoyment of their music does not require that I be reminded they are gay, it simply means nothing at all to me.
Labeling music as "gay" would seem to me to be a measure of division and separatism, rather than that of inclusion of gay people.
With such a catogory, why would there not then be catagories as described in other posts...songs written by "fat", "bald", "short", "accidentally neutered", "virgin", "frigid", "elderly",
..."peg-legged", "cross-eyed", "knock-kneed", "pot-bellied","downright ugly" and "guys who ain't got none fer ages" classes of songwriters?
Why? Because they doesn't and shouldn't matter in the grand scheme of enjoying music.

-GP