Harmonica MasterclassJoe's most in-depth workshops in the continental US have been presented in conjunction with the Harmonica Masterclass. Watch itinerary for upcoming dates. Joe, who considers David Barrett to be the World's Best Harmonica teacher, works his hardest at this event just trying to keep up with him. Also, this is the best opportunity to study the country blues traditions with Joe. The classes he designs for the Masterclass are always his best.