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World's largest music festival serviced by Gabisom with major Outline GTO line-source system The 2011 edition of the now-legendary Rock in Rio festival featured a bill that included Red Hot Chili Peppers, Guns ‘n’ Roses, Coldplay, Metallica, Elton John, Stevie Wonder, Jamiroquai, Katy Perry, Rihanna, Shakira, Motorhead, Claudio Sanchez (Coheed and Cambria), Lenny Kravitz, Snow Patrol, Maroon 5 a..