The fifth edition of the three-day BottleRock music festival in Napa Valley is expected to draw about 120-thousand fans. The festival gets underway today and features headliners Maroon 5, Tom Petty & The Heartbreakers and the Foo Fighters. In all, over 80 acts are slated to perform on four stages over the weekend. They include Fitz & The Tantrums, Michael Franti & Spearhead, The Roots and Live. Gates open up at 11:00 this morning.