I need good duets! Please Help
 

I need to find some good duets for a friend in California who is doing a cover duet show. If anybody had good male/female duets to suggest please do!
To give you a hint at what kinds...so far I have
Incubus and guest from the Stealth soundtrack-Neither of Us Can See
Pj Harvey & Thom York - This Mess We're in
Nickel Creek - Lighthouse's Tale
Maybe...Iron and Wine - Such Great Heights

This is what I've managed to find so far, I really need some more good ones so any recommendations are very welcome. Thanks!