Paul writes from NYC to tell me about a fantastic project he's running with kids from various high schools across Brooklyn, Queens and Manhattan. They build guitars and tin-can amplifiers, then record the results to make a radio show which you can download from the site. Paul says: "They spent a lot more time making the instruments than learning to play and record, which shows in the mp3, but the guitars sound good." Why didn't I do this at school when I was 14?