Riccardo Stracciari - Per me giunto... O Carlo, ascolta (Don Carlo) - 1914

Hello? Why hadn't someone uploaded this before? It's certainly one of the finest readings of the scene, even in an era replete with Verdi baritones.

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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): https://bit.ly/2W4qmE3