I'd say it's more like it expanded. But, here's the thing with me - I love to sing. It's rare for me to listen to a song I know without singing along. I tended to stay away from most female vocalist songs, since back then I only WISH I could sing like that, and could be dysphoria-inducing. Now I'm discovering all sorts of great female vocalists bands.
I've always been a fan of heavy metal (Judas Priest, Megadeth, Anthrax, and more recently DragonForce & Blind Guardian are my faves), but I like pretty much all types of music, to a certain degree. I can't stand country music made after the 70s, for example.
Actually, the only type of music I've listened to less now is anime music. That may be due to my lessening interest in the medium - mainly modern anime. I'm still a huge fan of the giant robot genre, but mainly older series. I sang along with themes from Mazinger, Getter, Macross, GaoGaiGar, etc..., all of which are somewhat deep-voiced songs, so I'm not wanting to sing like that anymore (I still like watching the shows, though!).
The one anime band I'll never stop listening to though is Fire Bomber. I'll love them forever.