Irving Berlin's duet "Play A Simple Melody" ( with the "Musical demon sets your honey a-dreamin', won't you play me some rag" countermelody) would sound great and is a lot of fun to sing. You might even try the SCARBOROUGH FAIR/CANTICLE that Simon and Garfunkel did.

Many women record songs with harmony overdubbed -- Bette Midler on "THE ROSE," many of Kate Wolf's songs, Judy Collins singing "That's No Way To Say Goodbye," etc. Those songs/harmonies would make great duets. Or try some of the old Everly Brothers duets like "LET IT BE ME" and "Devoted To You."

There's a duet that's usually done with a male and female voice but which two female folkies might pull off. It's called "ONE MORE DANCE," and it was recorded by Miriam Makeba and Harry Belafonte.

Gordon Lightfoot's "IF YOU COULD READ MY MIND" also makes a great two-part harmony song. (Didn't he overdub the harmony on that, too?

Genie