Dragon Ash is the group to bring rap and hip hop into the Japanese mainstream. The group, formed in 1997, has even coined a new genre in Japanese popular music: Mixture-kei. Their use of rap, hip hop, punk, rock, reggae, and Latin influences makes their music not only unique but they popularized hip hip in a country where little was being produced in the genre. Their lyrics are often positive and upbeat in comparison to today's American gangsta rap. The group has enjoyed some notoriety outside of Japan since the release of their song Shizukana Hibi no Kaidan o, which was the ending theme for the popular Japanese film Battle Royale. They continue to produce music and tour today.