Biography
Mittensさん, real name Jacob, is a hip-hop beatmaker based in Los Angeles, US. With a background in lo-fi and chill hop, and a love of house music, Mittensさん is also well versed in the art of future bass, happy hardcore, and many other outlying genres of electronic music.
"さん" roughly translates to "Mr. Miss", so their name could be interpreted as "Mr. Mittens".
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https://soundcloud.com/xmittens
Biography text from Last.fm, available under CC BY-SA.