James Nash once gave some good advice to aspiring guitarists: Rule #1 for learning to play fast:  don’t practice while watching the ball game.  Well, tonight…I’m guilty.  Two hours after starting, I’ve finally put the last instrument back on its stand.  I was watching baseball the entire time. However, I suspect that the San Francisco-based Nash would approve of my choice of ballgame, as the hometown Giants are in the World Series against the Detroit Tigers. And while I didn’t get any real practice in tonight, it sure was fun to multitask around two things that I love.  (Note to regular readers:  Candice, who has become a baseball fan this year with the emergence of the Nats, is out-of-town. I wasn’t ignoring her.) I grew up as a Giants fan.  The Braves hadn’t moved to Atlanta, so we didn’t have a MLB team in the South.  And Willie Mays is, to my mind, the most complete player in the history of the game.  He was so much fun to watch as a young kid in …