IIt may well be a truism to say that American music is African American music, but that doesn’t make it any less true. And when we reduce truths down to truisms they lose the granular detail that makes them interesting and relevant. Everyone knows, for example, that there would be no rock and roll without Robert Johnson at the crossroads and Little Richard in his sequined jacket and pompadour. But how many people know that without North Carolina-born Lesley Riddle, A.P. Carter’s onetime musical partner, folk and country music as we know it might not exist?