A comparison of the phrase "Talor dal mio forziere" in the aria "Che gelida manina" from Puccini's La Boheme.
In the portamenti they both apply between the notes Eb4 and Ab4 on the "ah" vowel of "talor", we hear a more open vowel maintained in Di Stefano's example while in Pavarotti's there is a slight modification of the vowel.

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