I'm with the band: jamming with the kids from School of Rock
School of Rock, the Broadway hit based on the smash film, is blasting into Britain. Tim Dowling grabs his Fender and challenges its cast to a battle of the axes " but finds himself hopelessly outclassed"Sorry, can you just show me that again?" I say. "It basically starts on the seventh fret," replies Jake Slack, 13. "On the G and B strings. Sometimes, I do it like this." He's off again, too fast for me to keep up. I'…