Hikaru Utada (宇多田ヒカル, Utada Hikaru; born January 19, 1983) is a Japanese singer, songwriter, and producer. She is considered to be one of the most influential and best-selling musical artists in Japan. She is best known by international audiences for writing and producing four theme-song contributions to Square Enix and Disney's collaborative video game series Kingdom Hearts: "Simple and Clean", "Sanctuary", "Don't Think Twice", and "Face My Fears".