MerleFest, presented by Window World, will hold its 36th annual festival April 25-28 on the campus of Wilkes Community College. Today festival organizers announced MerleFest pioneering artist John Cowan will join the already stellar lineup, including appearances by Old Crow Medicine Show, Turnpike Troubadours, The Teskey Brothers, Nickel Creek, Sam Bush, Jerry Douglas, The Earls of Leicester, and many more.