Music luminaries and some of the brightest stars in Austin City Limits' five-decade history return to the fabled ACL stage in Austin, Texas to celebrate the show's 50th anniversary. The all-star line-up includes Leon Bridges, Billy Strings, Gary Clark, Jr. Lyle Lovett, Shawn Colvin, Ángela Aguilar, The Avett Brothers, Indigo Girls, Rufus Wainwright, The Mavericks and more. Longtime Austin City Limits supporters and Austin-based actors Jared and Genevieve Padalecki ("Walker," "Supernatural," "Gilmore Girls") co-host the special. The two-hour broadcast offers salutes to ACL icons, including Willie Nelson and Stevie Ray Vaughan, and features behind-the-scenes interviews along with rarely seen vintage clips from the ACL archives.