Guitars on Fire pairs a solo performance by Molly Tuttle with Marty Stuart and His Fabulous Superlatives at ACL Live in Austin. Part of The Cosmic Twang Tour, the bill gives roots-music fans two different approaches to guitar playing and songwriting in one Sunday evening. Tuttle's blend of bluegrass and Americana sits alongside Stuart's country band, making the musicianship the attraction. The downtown theater concert begins at 8 p.m., and tickets are required for this specific performance.