Kozaburo Hirai (平井 康三郎, Hirai Kōzaburō; 10 September 1910 – 30 November 2002) was a Japanese composer and professor of music. He was the father of pianist, composer and musicologist Takejiro Hirai and cellist Jyoichiro Hirai.
Source: “Kozaburo Hirai”, English Wikipedia (CC BY-SA 4.0), excerpt