This is way better than School of Rock; over in Mr. R's class in Brooklyn, the little ones are becoming luthiers. Mr. R, Paul Rubenstein, works for Working Playground and teaches high school and middle school kids how to make electric guitars and amplifiers, a program he started 5 years ago. He tells us:"We make them entirely from scratch (except for the tuning machines) including the pickups. It has just grown since then... now we......