Musicians have been building on the past since the first notes were sounded; this week we’ll tune in to artists who’ve toyed with their roots to create something new. Jazz singer Cassandra Wilson tells us about returning to her home in Jackson, MS to record the blues and gospel-inflected CD Belly of the Sun. Bill Frisell positions his unique guitar style in a long line of ground-breaking musicians. Plus new sounds in country, jazz, blues, rock and more. Modern Roots, on American Routes.