The Indigo Girls are good! nice harmonies, good material.
I just heard aned saw them last night on satelite...a free concert.
Ann Hills and Cindy Mangsen have a duo album called "Never Grow Up"
Laurie Lewis and Kathy Kallick do an album togther called...."Together"
And Holly Near and Chris Williamson have a c.d. called Chris and Holly.
Then there is Trio.....not a duet, but good...Dolly Parton, Emmy Lou Harris and Linda Ronstadt.
Another Trio is called Hot Soup!
There are a few sister acts--again maybe more than 2, but good
Burns sisters, Bird Sisters,
Again, more than two, but the Four Bitchin Babes are out rageous...
These are all favorites, oh i cannot narrow it down to just one!(or 2)