Okaa-san (おかあさん, Okaasan) provided vocals to the song 魂は静かに眠りにつくように ～ 遠野郷の木葉梟 (Tamashii wa Shizukani Nemuri ni Tsuku you ni ~ Tounogou no Konohazuku) on the album 東方月燈籠 (Touhou Tsuki Tourou).