Sachiko Matsubara (Japanese: 松原 幸子; born 1973), better known by her stage name Sachiko M, is a Japanese musician.[1] Her first solo album, Sine Wave Solo, was released in 1999.[2] Working in collaboration with Ami Yoshida under the name Cosmos in 2002, Sachiko released the two disc album Astro Twin/Cosmos (2) which was awarded the Golden Nica prize in Ars Electronica, 2003.[3] She released Good Morning Good Night, a collaborative album with Otomo Yoshihide and Toshimaru Nakamura, in 2004.[4]