SUMMER CAMP SESSIONS: "Bertha" by Keller Williams​' Grateful Grass with The Infamous Stringdusters

Enjoy video of Keller Williams​' Grateful Grass with The Infamous Stringdusters​ performing "Bertha" on May 22, 2015 at the 15th Annual Summer Camp Music Festival​. Watch their performance of "Eyes of the World" here:    • SUMMER CAMP SESSIONS: Keller Williams​' Gr...   More footage and performance video from Summer Camp 2015 is coming soon! Directed by Jay Blakesberg Photography​ and edited by Andrew Feigl. Website: http://www.SummerCampFestival.com/ Twitter:   / summercampfest   Instagram:   / summercampfest   Youtube Channel:    / summercampfest   Snapchat: @SummerCampFest