JamBase.com has been the online leader for the jam-genre, now they’ve entered the festival game, branding an event at the iconic Gorge Ampitheatre in George, Washington for July 5th and 6th. They’ve just announced their lineup which includes Robert Plant & Sensational Space Shifters, Rodrigo y Gabriela, Slightly Stoopid, Michael Franti & Spearhead, Robert Randolph & The Family Band, G. Love & Special Sauce, STS9, Galactic, Railroad Earth, Bruce Hornsby & The Noisemakers, Lettuce, Nicki Bluhm & The Gramblers and ALO. Tickets go on sale March 16th at 10 AM PT on LiveNation.com with Early Bird Tickets priced at just $60. Check out the artist bios over at JamBase for detailed artist info.