When Southern rock acts like the Allman Brothers and Lynyrd Skynrd stormed American concert stages, detractors immediately came to the fore declaring the genre to be little more than a marketing gimmick. But those on stage themselves would have called its appearance not only inevitable but also a way of life. In the end, the musicians who played Southern rock reflected a robust and broad variety of influences, drawing deeply from the wellsprings of blues, rock, country, and even jazz. Listeners gravitated to the sounds of the New South, a place that had captured pop culture's imagination amid...