Momoe Yamaguchi
Keiko made debut with chorus part in band B.B.Queens then joined with J-pop female band Mi-Ke from 1991 to 1993, before starting a solo career. As a child, Utoku listened to a lot of music, including music made by Momoe Yamaguchi. She has written and sung many songs, such as "Wasurenagusa", and Sonic the Hedgehog fans remember her for her vocal work in the original version of the Sonic CD video game's opening and closing themes in Japan and Europe, "Sonic – You Can Do Anything" and "Cosmic Eternity – Believe In Yourself" in 1993.