Alerte alerte ou vous perdus

Alerte! ou vous êtes perdus!... Anges purs, anges radieux!
Sung in German

Marguerite – Emmy Destinn
Faust – Karl Jörn
Méphistophélès – Paul Knüpfer
Bruno Seidler-Winkler, conductor

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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):