What songs are in the Music Man?

I have a very high soprano voice. I'm 12. We're doing this for our school play, so it's only ages 12-14. Age does not count at all. I am in three choirs and have been singing since I was 2 years old. My twin sister and I were the only ones in the history of our school to make it into our school choir in 5th grade. Should I try out for Marian the Librarian? I will be against some eighth graders to try out. Should I try out for Marian or another part? Also, what songs does Marian sing? Thanks!