Singin' in the Rain auditions?

I'm 15 and auditioning for a youth production of Singin' in the Rain. I want to be Cosmo but I can seem to find the right song. I think I have a good chance of getting the role because I'm the only guy who can really tap dance there. I was thinking of What Do I Need With Love from Thoroughly Modern Millie, but I don't know. Any suggestions?