They achieved great success in Japan, and from 1969 to 1973 released an average of two albums and four singles a year.
As a vocalist for the video game Final Fantasy IX, she performed the main theme "Melodies of Life" in both Japanese and English.
Due to the English version's popularity, a special single was released, "Final Fantasy IX" Original Soundtrack.
In 2006, she was asked by Nobuo Uematsu to perform a "defining version" of the song at the Final Fantasy Voices Concert; she sang a version that combined the Japanese and English lyrics.
Shiratori also performed a vocal arrangement of "Epona's Song" for The Legend of Zelda: Ocarina of Time Re-Arranged Album, and narrated, as well as performed, the opening and ending themes to the 1990-1992 Moomin anime television series.