Kazumasa Hashimoto (b. 1974 in Tokyo, Japan) is a Japanese composer, mastering engineer and web designer.

As a child, Hashimoto learned classical piano, starting to compose in high school while making music on his computer. He majored in composition at Tokyo College of Music. His minimalistic music is a rich blend of electronic textures, digitally distorted voices and acoustic instruments such as cello, violin and clarinet, and makes extensive use of the piano.

As a pianist he has collaborated with Japanese electronica artist World's End Girlfriend and with world music artist Souichiro Suzuki. In 2005 he was featured on Childish Music, an anthology of music compiled by Ekkehard Ehlers in "an attempt to define a new genre" of "naive sounds".

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