In this site: Click here you will find an interesting article regarding the reasons why Mario was never a star in the Opera world, but rather in cinema. I would add a very humble personal opinion: if he had such luck of discipline as a singer, as it is mentioned, I guess that all great doors of the Opera closed for him, no matter how valuable was his voice. On the other hand, we have to agree that some glitches and exaggerations were a negative factor, and his performance is far below that of the great tenors like Nicolai Gedda, Franco Corelli, Alfredo Kraus, Giuseppe Di Stefano and many contemporary artists who are not only owners of extraordinary voices, but are models of disciplined work. Once again, serious dedication becomes the most important companion of a good voice.

And in this one: Click here there are some good WAV samples of songs and opera excerpts. Excellent indeed, but .. it seems to not have been enough.

Un abrazo - Andrés