Official:
Hora http://www.ka7.koalanet.ne.jp/~godsynth/
Schwarz Stein http://midi-nette.com/midinette/ss/
Related: Kaya http://rose.cage.to/
Mine:
...and I guess you can have my banner too, just cause I think it's cute.
Unofficial (Fan-made):
A very lovely Kaya fansite that makes this one look...well...not cool ;_; Discography for Schwarz Stein here.
(ps. I did the translations)
Red's site with gallery, fanart, and everything Hora related that was not on here.
