Sorry, Nbrisby, but that's bull crap. Yes, there are considerably less shows to do in opera. But, the songs are MORE difficult in musical theatre?!? Are you insane? Have you sung any Wagner?!? Bizet? Rimsky-Korsakov? Friggin' Mozart?!? Find one song, ANY song in musical theatre that is as difficult as the Queen of the Night aria from The Magic Flute and I will concede. Not that I'm trying to say that one form is better than another, for the love of God, I love them both dearly. But opera singers have devoted their LIVES to their voices. Some opera singers devote their lives to just studying how to sing Wagner!
Robert Preston never even sang! Okay, not an all-encompassing example, but you get the point...
Word. Word, indeed.