Input: concept: Mtv  answers:  ['Twisted Sister', 'Suicidal Tendencies', "Guns N' Roses", 'Red Hot Chili Peppers', 'AC/DC', 'Nirvana', 'Run-D.M.C.', 'Ice Cube', 'The Offspring', 'Metallica']
Output: 

 who sang at the mtv movie awards 2011?