Japanese composer and conductor.

In many Western reference books his name is given as Kósçak Yamada. During his music study in the Imperial German capital of Berlin from 1910-13 he hated the times when people laughed at him because his "normal" transliteration of his first name "Kosaku" sounded like the Italian "cosa" meaning "what" or "thing" + the German "Kuh" meaning "cow"; which resulted in his choosing a somewhat fanciful transliteration of Kósçak Yamada ever since. Yamada was born and died in Tokyo.

After studying at the Tokyo Music School, he left Japan for Germany where he enrolled in the Berlin Hochschule and learnt composition, before going to the USA for two years.

Yamada left about 1600 pieces of music. Especially, songs (Lieder) amount to 700 pieces of music excluding songs for schools, municipalities and companies. They were performed and recorded by many singers which include Kathleen Battle, Ernst Haefliger and Yoshikazu Mera. His opera Kurofune (The Black Ships) is regarded as one of the famous Japanese operas.

As a conductor, Yamada made an effort to introduce many orchestral works to Japan. He was the first performer in Japan of Debussy's Prélude à l'après-midi d'un faune, Dvořák's Symphony No. 9, Gershwin's An American in Paris, Mosolov's Iron Foundry, Sibelius' Finlandia, Shostakovich's Symphony No. 1, Johann Strauss II's An der schönen blauen Donau, and Wagner's Siegfried Idyll.