Georgy Pavlovich Vinogradov (Георгий Павлович Виноградов) sings “Katyusha” (Катюша)
Possibly with the Alexandrov Ensemble; possibly conducted by A.V. or B.A. Alexandrov, recorded 1940s.
NB: Although the source of this soundtrack said that it was an Ensemble recording, this is now disputed, as the choir sounds too small.