Looking for this vocal track of Youmu Konpaku's theme in this YouTube link.

http://www.youtube.com/watch?v=yK8XRjeXPr4&feature=related

It's definitely from one of the doujin-made soundtracks, but if someone can lead me on the artist or remix title would be enough. :)

Found the details of the track. The name of the album is 東方不可拘束～the maximum moving about!～ It was featured during Comiket 72, and more info can be found here:

http://sekken.sakura.ne.jp/03huka/hukakousoku.html

The full track I was looking for is available for download as a sample from their album, which is nice if you only want the single.