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]

• Filament 1 (1998) with Otomo Yoshihide
• Un (1998) with Toshimaru Nakamura
• Four Focuses (1999) with Martin Tétreault, Yasuhiro Otani, and Otomo Yoshihide
• Filament 2 (Secret Recordings 2) (1999) with Günter Müller and Otomo Yoshihide
• Sine Wave Solo (1999)
• Do (2001) with Toshimaru Nakamura
• Tears with Ami Yoshida as Cosmos (2002)
• Les Hautes Solitudes - A Philippe Garrel Film: Imaginary Soundtrack (2002) with Otomo Yoshihide and Taku Sugimoto
• Artefact (2002) with Philip Samartzis
• Good Morning Good Night (2004) with Otomo Yoshihide and Toshimaru Nakamura
• Manafon (2009) with David Sylvian

• Where We Are (Bccks, 2012)
• Sachiko M Sound Installation: I'm Here: Shortstay (Bccks, 2013)
• All About Sachiko M: Intro (Bccks, 2013)