This article is about a/an band in the Metal Hero Series. Koorogi '73 (こおろぎ'73, Kōrogi Nanajū-san?) were a Japanese backing vocals group best known for their contributions to Toei's Metal Heroes series. The group was disbanded after 1990. External links Koorogi '73 at the Kamen Rider Wiki Koorogi '73 at the RangerWiki Retrieved from "https://metalheroes.fandom.com/wiki/Koorogi_%2773?oldid=24913" Categories: Bands Choujinki Metalder Community content is available under CC-BY-SA unless otherwise noted.