Cornelius (born Keigo Oyamada (å°å±±ç”°åœå¾) January 27, 1969 in Setagaya-ku, Tokyo, Japan) is a Japanese recording artist and producer. Oyamada's first claim to fame was as a member of the pop duo, Flipper's Guitar, one of the key groups of the Tokyo Shibuya-kei scene. Following the disbandment of Flipper's Guitar in 1991, Oyamada donned the "Cornelius" moniker and embarked on a successful solo career.