On Saturday, 9/10 MTV, VH1, and CMT will air a live benefit concert to raise donations for Hurricane Katrina victims. The shows (taking place in NY, LA, Atlanta and Nashville) will feature Ludacris, Green Day, Gretchen Wilson, Usher, Alicia Keys, John Mellencamp, Dave Matthews Band, Rob Thomas, David Banner, and the dude from Linkin Park. (Beck, Kanye, Trent Reznor, and ...