Keigo Oyamada (小山田 圭吾, Oyamada Keigo, born January 27, 1969), also known by his moniker Cornelius (CORNELIUS（コーネリアス）, Kōneriasu), is a Japanese musician and producer who co-founded Flipper’s Guitar, an influential Shibuya-kei band, and subsequently embarked on a solo career. In 1997, he released the album Fantasma, which landed him praise from American music critics, who called him a “modern-day Brian Wilson” or the “Japanese Beck”.
Oyamada was born in Setagaya, Tokyo, Japan. His 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. He chose his pseudonym in tribute to the character of the same name from the movie Planet of the Apes. He commissioned a song, about himself, on Momus’ 1999 album Stars Forever. (read the complete article at Wikipedia)