"If music had calories, I'd weigh ten-thousand pounds." JWH. Start with today, he says. This after we confess to writer's block: "There's too much to tell!" Today, he suggests. Always good advice, but not the most common when approaching a biography. Most people want to start at the beginning. Give the D.O.B. and move on from there-crawling, walking, talking, so forth. But the man is all about turning things upside down and, knowing his track record, we take the advice; we follow his lead. And so today: Today, after slowly coming to his feet and tugging on his boots, after a cup of black and a smoke (or two), John William Harrelson teaches some classes. Courses in the history of Rock and Roll, of Jazz, of Music in America and beyond. Courses that SoCal college kids have the good fortune to find themselves attending, learning the who-what-when-and-where's of that thing that means so much to them, yet they know so little about. Harrelson brings to the podium years of both scholarly and practical knowledge. Part professor, part player, he's that rare bird in academia who can walk it and talk it, having earned his PhD in Historical Musicology at Claremont Graduate School in 2000 and his street stripes over nearly five decades as a musician, performer, songwriter, instructor, writer and producer. On any given day he can be found doing any one--or all--of these things. He continues to perfect his considerable skills as a master of the guitar (all styles) and keyboard (piano,