'Those roots are really here': From the Carter Family to Bill Monroe, unearthing the hidden history of Charlotte country music

Back in the 1930s, more country music was recorded in Charlotte than in Nashville, Tennessee. Some of the Charlotte recordings from that period have become part of the essential canon of traditional country music, from "the first family of country" — the Carter Family — to the first career steps of "the father of bluegrass" Bill Monroe. So how did Charlotte become the center for country music? And why isn't it any longer?