Sadly, Luciano Pavorotti died today. A fine appraisal can be found in at nytimes.com, including this quote (I added the bold):

By natural endowment Mr. Pavarotti was essentially a lyric tenor, ideally suited to lighter roles in Donizetti, Bellini and Verdi requiring lyrical grace and agile passagework. Yet his voice, like everything about him, was uncommonly large. With that big throbbing sound, he was tempted into weightier repertory requiring dramatic power and heft, like Calaf in Puccini’s “Turandot.” Some opera purists maintain that Mr. Pavarotti erred by straying from the lyric terrain. Don’t tell that to anyone lucky enough to have heard him sing “Nessun dorma” in his prime, not just as a signature aria for televised stadium concerts, but in the context of a full production of “Turandot.” Wow!

See: Italian Operatic Artistry at Its Finest – New York Times