First I want to say that I apologize if this is not the right board to post this. All of the projects here seems to be game-related and I didn't find anything about websites. I think it's the right one though.
Anyways...
I found Touhou about a year and half ago and ever since I was fascinated by the soundtrack and music made from it. I was searching it with youtube, Touhou wiki and VGMdb, but none of them were meant to use like that, so they weren't very efficient. I wanted to search arranges by music type, original songs, list all the arranges by an artist whose song I liked. About a month ago I got an idea to create that kind of database on my own as a Summer project. Now I've finished it just a couple of days ago.
Echo, Touhou music databaseThe idea of the site is quite simple. Anyone can add remixes, artists, circles and albums there and these are linked to each others, so by remix you can find albums, artists and circles, by artist you can find his remixes, albums and circles and so on. Remixes are also linked to original songs, music genres and such and can be searched by them. Later I also added a rating system to separate the popular content from less liked ones. My English is kinda limited, so I really can't describe well how the database works, so I'd prefer if you just tested it. ^^
About copyrights and stuff, after I've read the copyright and piracy rules of these forums I think that they're quite similar to the ones of the music database. It's doesn't provide any download links or such on its own, but it isn't responsible for the content of user-submitted links. However the linking system is mostly used for home pages of groups and artist and Youtube links, which I think are allowed here. After all, Youtube handles videos violating copyrights on its own, so theoretically there shouldn't be any copyrights violating videos uploaded. Naturally chances for it are next to none though.
The site is quite new though, so there's not much to search yet. However the adding system should be working and adding and registering is completely free. After all, the more data added the better. And not only the most popular arranges are welcomed but the less known too.
Feedback and improvement ideas are welcomed. Any questions will be also answered.
tl;dr click the link and see.