By Dan Shapley
You might know the name Kevin Wall. But 150 musicians do, and that makes all the difference. Wall is the Emmy-winning producer organizing the Live Earth eco-extravaganza, which on July 7 will feature 150 artists (at this point) on nine stages (if he doesn't book another) spread across seven continents (yes, scientists will rock out in Antarctica). The money raised by the concerts will fuel a foundation devoted to fighting climate change. Oh, that's the other thing to know about Wall: He really believes music can make a difference, according to a story in the May 18 Los Angeles Times.