If I remember correctly weren't some Broadway songs sung last year?
Jen Hudson sang Circle of Life. Although she wasn't my favorite performer that was really stand out performance.
Infact the most memorable performances last year were from musicals. LaToya sang "Don't Rain on my Parade" which was phenominal, and the song that made Diana memorbale was "Don't Cry Out Loud" which I believe is was sung in "Boy From Oz" (don't shoot me, I never saw it/don't have the CD).
All I am saying is that I think choosing the right songs could make for a great show, and who knows with such a wide audience it could open up Broadway to a whole new audience. Not such a bad idea - that is if the contenstants don't spend the entire song doing riffs.
I want to write music. I want to sit down right now at my piano and write a song that people will listen to and remember and do the same thing every morning...for the rest of my life. - Jonathan Larson. Tick, Tick...BOOM!