There are at least three bands/musicians using this name: (1) Cornelius (born Keigo Oyamada (小山田圭吾 Oyamada Keigo) 27 January 1969 in Setagaya-ku, Tokyo, Japan) is a Japanese recording artist and producer. His name is a reference to the Planet of the Apes chimpanzee character of the same name played by Roddy MacDowall. 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.