RICK HALL The creator of the Muscle Shoals sound reveals the secrets to his success By Michael Gallant Muscle Shoals was ground zero in the ’60 and ’70s for a wide range of artists—Aretha Franklin, Wilson Pickett, Etta James and many more—who recorded some of their biggest hits in this tiny town in northeastern Alabama. The potent, soulful vibe that emerged had such an impact that it became known as the Muscle Shoals sound. And the man at...