Aughts-era post-grunge pop rockers Nickelback will serve as the Friday headliner for the Cattle Country Music Festival, scheduled for April 10-12 an hour east of San Antonio, according to concert organizers. Before Nickelback's addition, the three-day jamboree near the town of Gonzales had already unveiled a nearly complete lineup, largely oriented around county and Americana. Parker McCollum, Tanya Tucker, Clint Black, Ray Wylie Hubbard, Chase Rice, Wyatt Flores and Clay Walker and others are some of the bigger names on the bill.