I just heard it, and was on my way here to post it. You beat me to it. In my opinion there was nobody more influential to rock and roll guitar than Chuck Berry. I've always said he was the true king of rock and roll. His style influenced everyone from the Beach Boys to Elvis Presley, Stevie Ray Vaughn, and many others. Including many current rock, blues, and country artists. I'm not often saddened by a celebrity death, but I am with Chuck Berry. Going to play a little guitar in his honor tonight.