I watched a DVD recorded in the 60's where he plays Nemorino in "L'Elisir D'Amore" by Gaetano Donizetti, and he is still brilliant in a more recent recording, as you can see here on YouTube. In my opinion, it is hard to find a voice as good as his to perform this aria. I watched a bunch of them (including Pavarotti, Vilázon, Alagna, Lanza, and even Caruso, whose recording was used by Woody Allen in his "Matchpoint" movie) and they don't top him.
Rejoice getting the libretto for this aria and listening, with all your attention, to this more than amazing performance. I would also suggest to listen to the "Quanta è bella, quanta è cara!" too.
Now I understand the reason why one of my high school Portuguese teachers started to sing one aria of Bachiana Brasileiras (I think number 5) in front of the whole class. His excitment was noticeable. And so was mine listening to these aforementioned arias. Of course all my colleagues mocked that teacher because they couldn't see the beauty in it, but now I can value a teacher that tries to shows that to his/her students.