Biography
Japanese male chorus group. Formed in 1951 by Hiromu Takamizawa, Tohru Sasaki, Tetsu Kiso, and Hajime Toyama.
Hajime Toyama is the only living member at 90 years, and still performs as "ダークダックスのゾウさん" [ Dark Duck's Zo-San]
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http://www.tasc.or.jp/~pipedan/other/darkdacks0001.html
https://is.gd/darkducksJPwiki
Biography text from Last.fm, available under CC BY-SA.