Buddy Guy (R) and John Mayer perform at the 20th anniversary Farm Aid concert in Tinley Park, Illinois September 18, 2005. Farm Aid staged its 20th annual star-studded benefit concert on Sunday, pledging help for overlooked rural victims of Hurricane Katrina and defending against charges of financial waste. The day-long show at an outdoor arena south of Chicago grossed $1.3 million in ticket sales and played to an enthusiastic crowd of more than 28,000. REUTERS/John Gress JG/NL