Onmyo-za is a heavy-metal rock band that performs songs about stories such as demon tales in various regions and the legend of MINAMOTO no Yoshitsune featuring innovative, heavy metal musical compositions, lyrics loaded with the Heian Period language and the musicians wearing long black hair with costumes from the Heian Period and it is the first rock band ever to hold a concert at a Noh theater in Japan.
プログレッシブなヘヴィメタル楽曲に平安古語を多用した歌詞などを載せ、各地の妖怪伝奇や源義経伝説などを黒髪長髪に平安装束を身にまとって演奏し、日本で初めて能楽堂においてコンサートを行った。