The Sing Out Loud Music Festival, the largest free music festival ever held in St. Johns County, returns this September for four weekends. Between September 1 - 23, hundreds of national, regional and local musicians will perform at various music venues around St. Augustine. The music will range from folk-tinged Indie Pop, powerhouse Soul, conscientious Punk Rock, bittersweet Americana, progressive Bluegrass, alternative Country and more. The initial artist lineup includes performances by Jason Isbell and The 400 Unit, The Decemberists,…