http://www.campstreetcafe.com/ You just can't go wrong with the Gillette Brothers, Guy and Pipp, ranchers and performers from Texas by way of Yonkers, NY, but they are the real deal. They are scholars of the music as well.

http://www.thepricklypair.com/   Prickly Pair, Les and Locke Hamilton, a husband and wife team from Wyoming, also ranchers and performers of the highest degree.

Both groups have sound files available.

Perhaps the most real deal out there is Glenn Ohrlin, rancher and former rodeo rider, but Glenn doesn't do internet so he doesn't have a site, but he is sufficiently well known that information is easy to find. Look around for his book, The Hell-Bound Train. Used copies are fairly easy to find. If you manage to find a copy, you'll be pleased with it, guaranteed.

I won't give you links because they are also easy to look up, but do consider Joni Harms and Stephanie Davis. I won't call them less authentic, but their music is a little more middle-of-the road at times. Good though!

Which of course reminds me of Bruce "Utah" Phillips, who does quite a bit of stuff that would be considered cowboy music.

A couple more easily located performers of interest would be Michael Martin Murphey and Don Edwards,.