It’s Labor Day weekend, and time to go back to school! Many of the lessons learned in school are valuable, but more often people carry their memories of great teachers, friends and growing up to think for themselves. Likewise, much of America’s greatest music — blues, jazz, country, Cajun — was passed on informally from master players, in clubs, at jam sessions or dances. We’ll visit two special professors who really believe in teaching the musical vernacular both formally and informally. Ray Charles shows kids how to play the blues at his Los Angeles studio, and trumpeter Wynton Marsalis tutors New Orleans high school students in jazz technique and appreciation. We’ll also talk to the all-teen Cajun band from French Louisiana, Feufollet, about why they learned to play traditional music. Plus, tune in to children’s songs and back-to-school anthems from Chuck Berry, Louis Armstrong, Willie Nelson and Aretha Franklin.