NOW 39Released on August 9, 2011, the 39th volume of the Now series features numerous singles that were, at the time, in the Top 40 of the Billboard Hot 100, including hyper energetic party songs like LMFAO's "Party Rock Anthem," Katy Perry's "Last Friday Night (T. G. I. F.)," Pitbull's "Give Me Everything," Britney Spears' "Till the World Ends," Jennifer Lopez's "On the Floor," and Lady Gaga's "The Edge of Glory." The inclusion of Jason Aldean's "Dirt Road