Music Assessment! Can you give me your 2cents?

For my practical music assesment I have to sing two contrasting pieces. I've chosen Cyndi Lauper's Time After Time.. anyone know a contrasting piece? Just your opinions would be great! I'm mostly a pop/ballad girl but like I said any opinion.

Btw contrasting means opposute in some way... fast contrasts slow, rock contrasts hip hop or pop etc..