Hm, I can sing alot of songs from diffrent animes...
Like, I already have Haruka Kanata, Namikaze Sattelite, Hero's Comeback, and Fighting Dreamers from Naruto memorized, and I have both Loveless themes, and a bunch of others that would take to long to explain. I've memorized almost all the themes from the animes I watch now. I'm still working on two, though. The first openening themes of Blood+ and Bleach are still getting me.
I can also sing multiple J-Rock songs, like ones from Phantasmagoria, Alice Nine, An Cafe, Dir En Grey, suG, and Kagrra, if only to name a few. ^^
And, well, that's all that I can say about that! ^^