Real name: 松居慶子 = Matsui Keiko (Maiden Name Doi = 土居)

Japanese jazz keyboard player and composer. Member of Cosmos (21) alias Keiko Project.

Wife of Kazu Matsui (The Kazu Matsui Project). Graduated from Japan Woman's University (Nihon Joshidaigaku) majoring in the children's culture. Studied music in Yamaha Music Foundation where she became a top student in Yamaha System and was selected to be the recording artist for them when she was 17 years old. She composed her first major film score that year.