Question: Efrem Flaks was the original performer of songs composed by which other Soviet film composer?
Sentence (from "Efrem Flaks"): He graduated from the Leningrad Conservatory (vocal class) in 1936, from 1939 to 1942 and from 1950 to 1970 worked as a soloist at the Leningrad Philharmonia, from 1943 to 1950 at the Leningrad Radio.
Relevant evidence: No