Good song for try-outs?

i am trying out for two plays this spring, one for my school and one for a theater group i am contained by and i was wondering what song to sing
i want to really wow everyone because nearby are some really talented citizens that are also trying out
i want something that will show off how powerful & smooth my voice is, any suggestions? all right!! I'm 12 and Ive tryed out for the last 2 talent shows and ending 3 theater and won both times and got 3 REALLY upright parts by singing "Defying gravity" by the musical wicked. It shows your inventory and how loud you can sing. but be warned this is not an uncomplicated song. the first couple of times you will not be able to take it unless your like Americas best singer :] appropriate luck luv
run by snow patrol
the nicest thing by kate nash
both lovely songs which enjoy a build up =)
love song
http://www.youtube.com/watch?v=MR5xv3pt7...
this song is smooth, jazzy, and a somewhat good stock. AND IT ROCKS! do it and tell me how it turns out!
anything jonas brothers or miley cyrus they rock!