As filmmaker Robert Mugge (HELLHOUNDS ON MY TRAIL) tells it, he went down to Louisiana to film a Rock and Roll Hall of Fame bus tour. Distracted by Louisiana's thriving musical culture, he went off on his own, and the Hall of Fame's loss is music lovers' gain. Mugge wound up making a light, entertaining musical travelogue down the highways and byways of the Pelican State: taping performances, interviewing a few legends and dropping in on various musicologists for a little historical perspective. The journey begins in Shreveport with a tribute to the Louisiana Hayride, the hallowed country music revue that helped deliver rock and roll into the world. There's a stop in...