Sing a song

Okay, everyone. I need your help.

Does anyone know of any songs that are the following:

1. A duet, or a song that can be broken into a duet, between a man and a woman that is somewhat contentious in nature?

2. Female empowerment songs ala 'I am woman, hear me roar'

3. A song about how peace is better than war

This is for our production of Lysistrata in the fall.

Thanks!