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Each year since Comiket 64, fans of the Touhou series have released arrangements of themes from the games at various conventions year-round. The fan music scene has grown exponentially since then, and there are now hundreds of groups dedicated to arranging music from the Touhou series. It has become so large that it has spawned events solely based around creating Touhou material, such as Reitaisai and Touhou Kouroumu.
For a list of doujin circles, see here