HI bee-
About Bocelli...If i am giving you TOO much info from what your question asks, please bear with me

or just stop reading part way through...
As for OPERA, amongst the cognescenti he is pretty much despised for his success along with what they perceive is no or little talent.
If you have any of his opera cd's, they speak for themselves, as do his 'pop' cd's.
His live opera performances are something different from a cd. He is accused of having a 'small' voice, too small for opera venues. Having heard him do opera live (he is always UN-miked) i can say he is not as powerful as the other performers, but the beauty of his voice makes up (for me) any power he is lacking.
As a sidebar to live opera, having a blind man up there on stage acting, interacting, singing...well there is a great sense of respect and awe on one hand of his talents and abilities...on the other hand, it is a bit of a tight rope, edge of seat experience, hoping that no mis-steps are taken or prop mishaps. You want everything to go perfectly for him, but know there are so many things that could go wrong. He also has terrible stage fright...all things considered the man overcomes huge obstacles and still comes through singing beautifully. i have tons of respect for the guy.
In concert he is heavily miked, in those huge venues. He sings mostly arias in concert, peppered with a few of what are considered 'pop' songs...like from Romanza, Sogno, etc. The sound systems in these place can be awful. I always got as close to front row as i could.
I recommend seeing him live if you like him/him voice. If you adore him, try to see him in a live opera. He does not do very many and always in very short runs.
I have some pictures of the guy that i shared with the folks at bocelli.de. They have a german/english site.
If you are interested in viewing a short list is:
1999 Werther, Detroit the after opening dinner.
2000 the statue of liberty concert, i have some nice photos.
2001 (?) i have some Hyde Park photos and some from Dublin the next day. i was in front row of both these outdoor concerts and got some pretty good shots.
A funny thing came of my attending those concerts. A couple of years ago, Bocelli release a dvd called "cieli di toscana" (tuscan skies). It was released in Europe before the U.S. I got an email from a friend in europe saying my concert bud and i were in the dvd. We are in the opening shots of the dvd which were shot at the Hyde Park concert. Clear enough to be recognized. My little claim to fame
regards,
L