Willie Nelson has been hosting a Fourth of July picnic/concert off and on for years, and for the 40th anniversary event they've brought all the stops. The line-up includes current country/Americana singers like Gary Allan, Justin Moore, Randy Rogers Band and Ryan Bingham, and legends like Nelson, Kris Kristofferson and Leon Russell. In all, 21 different singers or band will perform during the all-day festival at the Fort Worth Stockyards.