Highlighted comment from the commenters below:
From Shahrdad:
She sings Rossini with such conversational ease, and all those little notes pour fourth naturally and as a part of a melodic and conversational line, unlike the current flock of singers who don't sing music, but shoot notes at you like a machine gun, with no sense of grace or melodic line. And Callas sings that final high E-flat with such ease that she sounds like she could easily go up to an F or F-sharp (which she reportedly did in practice).
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