Robert Merrill - Cortigiani, vil razza dannata [Rigoletto] 

Yes, he flubs the words; who cares. I'm uploading this for the sake of completing the archive-for the sake of being able to see up close the physiological components of Merrill's technique in tandem with live-in-the-space acoustics. Out of the five greatest American operatic baritones-Tibbett, Bonelli, Warren, Merrill, and MacNeil-Merrill had the most (and most varied) video footage.
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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