Holiday Road: Atlantic/Southern Ground's Zac Brown Band will kick off The Great American Road Trip Tour May 24 in Lincoln, NE with a new member in bassist Matt Mangano. Mangano takes over for John Driskell Hopkins, who adds guitar, baritone guitar, ukulele, upright bass and banjo duties. Mercury's Kacey Musgraves will support on four shows during the summer. Get a complete list of dates here.