Wasn't expecting a Touhou thread here haha. I was actually into Touhou for a couple years before I got into anime and Im@s. Was mainly in it for the music though.
One of my favorite doujin groups/fave metal group of all time, that first got me into Japanese music.
https://www.youtube.com/watch?v=tKgkGiBYL80Those sexy, bada$$ riffs! I love their sound.
Fave vocal group covering the same song
https://www.youtube.com/watch?v=tIPyPaBx-aEThese guys also did the OP for Highschool of the Dead anime. I was actually a fan before then, so I was shocked and elated when i discovered they did the OP for a popular series and were finally going mainstream.
It was such a pain having to sift through 95% ear-grating music just to get to that 5% goodness every new doujin release, even harder trying to actually find them. I liked the wide variety though. Ever since I found Im@s however, most of my Touhou playlist has been replaced save the 2 groups above and a few others. I don't have to worry about looking around anymore, since just about all Im@s songs are quality stuff.