In 1974, Ronnie Van Zant sang. “Now Muscle Shoals has got the Swampers. And they’ve been known to pick a song or two,” in the song Sweet Home Alabama. What the heck did he mean by that? In Episode 143 of the Trampled Underfoot Podcast, Mark Lindsay shares facts about a very well made documentary titled Muscle Shoals that explains it. The conversation starts off with an examination of how people like Wilson Pickett, Aretha Franklin, Etta James, Clarence Carter, Percy Sledge, and Duane Allman, among others, came to this sleepy Alabama town to record some of the biggest hits in music history. How did it happen? Why that time…