As I was walking up to the stage at the Heritage Park Amphitheater in Simpsonville, S.C., a few weeks ago, the butterflies started to make some noise in my stomach due to what was about to happen. The singer I play with, Janiva Magness, and I were about to go on right before Buddy Guy and B.B. King — the two bluesmen who have had the greatest influence on my guitar playing since I was a kid.