The song "Otomisan" was made for being sung by Haruo Oka, but was eventually sung by Hachiro Kasuga and became a major hit in Japan in 1954. The single sold over one million copies. The song was composed by Masanobu Tokuchi, who came from the Ryukyu Islands. Kasuga's 1955 song "Wakare no Ipponsugi", composed by Funamura, also became a hit song. Funamura also composed Michiya Mihashi's 1955 song "Anoko Ga Naiteru Hatoba". "Ryōkyōku" singers such as Haruo Minami and Hideo Murata joined Japanese popular music. Hachiro Kasuga, Michiya Mihashi and Hideo Murata went on to form their genre later called "enka".