In its 26th year, Old Settler’s Music Festival is putting together one of its hottest lineups ever, but fans must act now to grab discounted ticket packages before they end on midnight Jan. 15. Single-day ticket sales begin Jan. 16 for the four-day bluegrass, roots and Americana festival, which takes place April 18-21 at the Salt Lick Pavilion and Camp Ben McCulloch south of Austin and features more than 30 acts.