Excellent choices above. Split Lip and Mountain Sprout are great. Another group I've been into lately is Trampled by Turtles. They put an interesting take on the genre, and do so tastefully. The Wilders are also fun to listen to, and truly have a good time while performing their music. For those who are into "jammy" music, Yonder Mountain String Band is fun to listen to. I'm seriously contemplating making a run to Winfield this year. Last minute-style!!!