Soviet composer, sound engineer and conductor. Organizer (1941) and first head of the State Orchestra of the USSR Ministry of Cinematography. Honored Artist of the Tajik SSR (1940). He began his creative career in 1905 as a conductor of an orchestra accompanying silent films. Studied at the Rostov Conservatory (1913-1918). During the silent film period, he led orchestras in major cinemas, scoring silent films and composing music for them. Since 1930, he began working in sound films (in 1931-1947 - sound designer and sound engineer). Since 1938, he was also a conductor at the Soyuzdetfilm film studio, in 1948 - Mosfilm. Conducted the premiere of the Second Suite by S.S. Prokofiev from Romeo and Juliet. David Blok wrote and edited music for more than 200 films. He was a member of the Jewish Anti-Fascist Committee. He was buried at the Vostryakovsky cemetery.