Monday Michiru Sipiagin (maiden name Mariano, more commonly known as Monday Michiru / MONDAY 満ちる born 19 August 1963) is a Japanese American actress, singer, and songwriter whose music encompasses and fuses a wide variety of genres including jazz, dance, pop, and soul. She is arguably best known for being a pioneer of the acid jazz movement in Japan in the early 1990's yet she has created her own unique style of music that transcends traditional definitions of the aforementioned genres.

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