music from Underworld’s  ” Born Slippy “,  Usher’s  ” Love in This Club “, and  the Cure ‘s “ In Between Days “. Khalifa appeared with  The Game ,  David Banner  and  Play-n-Skillz  at  U92′s Summer Jam at the  USANA Amphitheatre  in  West Valley City, Utah  on August 2, 2008. Khalifa released the mixtapes