"Glitter and Be Gay" from Leonard Bernstein's Candide is, according to Wikipedia, "among the most fiendishly challenging coloratura soprano arias". It's the quintissential example of an aria that requires an opera singer who can really act, or an actor who can really sing.
Can anyone do both? YouTube has some possibilities:
Chenoweth:
Dessay:
Gruberova:
June Anderson (with Leonard Bernstein conducting):
Mailing address:
Missouri Music Teachers Association,
Dr. Erica Manzo
Executive Secretary
266 Fine Arts Building
University of Missouri-Columbia
Columbia, MO 65211