The greatest soprano in the world today...

[Alan Howe]

...isn't Anna Netrebko, but the largely unsung Sondra Radvanovsky. She's even recorded Alfano's Cyrano de Bergerac, with Placido Domingo!

[thalbergmad]

Unlike you not to provide substantial evidence

Anyway, it is clearly Susan Boyle.

Thal

[Alan Howe]

Take your pick:
https://www.youtube.com/results?search_query=sondra+radvanovsky

And the greatest tenor in the world is Paul Potts 

[eschiss1]

Well, it depends on whether we're talking about terrific people (who are sopranos/tenors by voice type whether or not they've ever raised their voice in song or best (however judged...) singers qua singers in those categories..

[Alan Howe]

It was meant as a rejoinder to those whose critical faculties are apparently silent when faced with the latest recording by the over-hyped, overrated and distinctly overparted Miss Netrebko.

[adriano]

Oh, and remember crazy tenor Stefan Zucker, who made that hilarious film about the "voce di petto", featurning Magda Olivero, Anita Cerquetti, Giulietta Simionato, Leyla Gencer? He though he was the best - and highest - tenor in the world, so I searched - and those Youtube I could get were horrifying. Let's better open a thread "the worst singers..." :-)

[Alan Howe]

I'd never heard of Zucker - and now that I've sampled him on YouTube, I wish I hadn't bothered. There's definitely no Zucker in his Stimme...

[Gareth Vaughan]

Completely ohne Zucker

[adriano]

Here we have him:
https://en.wikipedia.org/wiki/Stefan_Zucker

and here is the film in question - don't get apoplexia by laughing! I first took it as a parody, but it's true!
https://www.youtube.com/watch?v=2R2mdzDhSvU
https://www.youtube.com/watch?v=yVYp-AwBY9U

[kolaboy]

... and Robert White is the greatest tenor.

[matesic]

I believe Stefan Zucker may have had a lot of influence on Sacha Baron Cohen. The best send-up artists are the sincere ones!