Ryu Seoung-hyun (born 9 Dec. 1982), better known as RAINBOW99 (a.k.a. Lulu), is an Korean musician, guitarist, composer, record producer, sound & noise designer, best known as one of the most famous guitarists of Korea.

RAINBOW99's solo work has been extremely influential, pioneering ambient and generative music, innovating production techniques. He also introduced the concept of chance music to popular audiences partly through collaborations with other musicians.
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