Call it six degrees of separation. The kids in 8th Grade Writer's Workshop are awestruck when their teacher announces that through her husband's cousin, she's met rock superstar Nick Thompson and has invited him to their class. He's come to talk about writing and he's even cooler than they imagined. Nick, known for his music as well as his lyrics, tells the kids his secret: A song is just a bowl of fruit-one must figure out how to paint it. Words...