Before the Grambling State University Tigers and the Southern University Jaguars battle it out in football at the annual Bayou Classic on Saturday, the schools' marching bands face off in their own duel. The competition also includes a Greek step show. Visit www.statefarmbayouclassic.com for a list of other related events. Battle of the Band tickets $21.90-$27.50 (including fees) through Ticketmaster (800) 745-3000. 7 p.m. Friday, Louisiana Superdome, 1500 Sugar Bowl Drive.