Midchuck mentions the Louvin Brothers, which is fine advice! Virtually any of the sacred or secular songs are worth learning. You might stay away from the ones that have been covered over and over but sometimes people really enjoy hearing those tunes such as 'If I could only win your love.' I recently mentioned 'SATAN'S JEWELED CROWN' in another thread and that's a very beautiful tune. Emmylou Harris was also mentioned and goodness, every one of her albums has at least 3 solid duets even if they aren't credited as such. Cheryl White and Fayssoux Starling back her up on lots of tunes and those that they sing on would be wonderful choices.

Oh how I wish I could find any Trad singer or band in Los Angeles who needed a harmony partner! I'm jealous of the fact that any of you even have singing partners. I don't mind singing lead, but I fall more naturally into the other role of matching someone else's phrasing. The few bands around here I have sat with are generally improvisational or bar bands given to rowdier fare. Of course, I haven't looked very hard.