hi there

could anyone recommend me a few bluesy-sounding jazz songs with relatively simple chords, a good rhythm and vocals that would be fun to play as a duet? my girlfriend and I play guitar together a lot, she likes to play rhythm and sing while I improvise solos over the top eva cassidy's version of wade in the water is a perfect example of the kind of thing I'm looking for (even if it's more gospel than blues or jazz!)

thanks a lot