It's probably one of the best genres you'll get for the lowest percentage of transvestite listeners. It's not only an obscure and extinct genre, but it would also constantly send them into a multi-paragraph meltdown of tears about the heckin' oppressed BIPOCs if it entered their ears on a normal basis.
Anything with "core" in it has a higher probability of having trannies within its fandom because that gets thrown around on the internet a bunch, which is where trannies spend much of their time.
I agree with the other guy, Jazz is probably the genre with the least amount of tranny listeners.