Mutsuko Fujii, a percusionist, a marimbist, and a Sanukite player (Sanukaite is a marimba like instrument made of a type of stone called Sanukite), graduated Tokyo Geijutsu Daigaku in 1970 and since then, she has been actively playing as a percussionist as well as a solo and duo marimba player. Her duo group (Fujii/Kikuchi Duo : Kikuchi=Tomoko Kusakari) commisioned over 40 peices of works, and is slated to have created "new sound" for the marimba duo. Since 1985, her solo activity gained momentum and this resulted in premiering many well known pieces like Keiko Abe's Prism Rhapsody. Naturally, she appeared in TV and Radio many times. She is also a composer and many works are published.

On the academic side, she teaches at Senzoku Gakuen University.

She also spend a lot of effort for music education of children, and is the Chiar of All Japan Children's Education League.