FILM: Maria Jeritza - Ritorna vincitor [Aida] - 1933 (CORRECT PITCH)

In 1933, Maria Jeritza starred in the only film role of her career-the eponymous Grand Duchess Alexandra in William Thiele's Großfürstin Alexandra, in which a late-czarist Russian wife escapes the Bolsheviks by becoming, improbably, a celebrated opera singer in Vienna.
Whether the audio we hear was recorded at the moment of the filming or was pre-recorded, it appears that Jeritza is in the actual act of singing and not merely mouthing words. She sings the German translation, "Als Sieger kehre heim."
Other TH-cam uploads of this clip have been pitched too high. I have corrected the pitch in this copy.
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This channel is primarily about vocal emission-aural examples of basically correct singing, correct impostazione-chiaroscuro, vowel clarity, firm and centered pitch, correct vibrato action, absence of throatiness or thickness, sounds free from constriction and from the acoustic noise that accompanies it-with occasional video examples that demonstrate what the body, face, mouth, jaw, and tongue look like when used with correct impostazione-the vocal emission of the one and only Italian school.
Caveat: I'm biased in favor of baritones and baritone literature, but if you want to learn about and listen to all the greatest singers in the old-school tradition, explore this spreadsheet (voice parts are separated by tabs): bit.ly/2W4qmE3