depends on what mood you want to go for. There are probably some good ones but I could only name a few from the top of my head. There's Les Mis "A Heart Full of Love." There's Aida's "A Step Too Far" or "Not Me" can be done, but there's actually two guys and two girls there. Then you can also do Secret Garden's "I heard someone crying." Even though the girl is a young child, she can be done with a mezzo (besides that song is just so wonderfully taunting).
"I haven't got a pail."
"Find your grail, your GRAIL!"
"But it's not missing. It's right on the counter where it's supposed to- defying gravity, my giant cup's gone!"
"Five hundred, twenty-five thousand, six hundred minutes. How do you measure... measure a year?"
"How many times do I have to tell you, it's five hundred twenty-five thousand, five hundred and eighty-five point thirty-two minutes. You will never graduate if you keep basing your math on showtunes."
"You ruin Broadway for me."
"As well I should."
