Dr. Dog Unveiled as Philly Music Fest Surprise HeadlinerDr. Dog, photo by Wyndham GarnettDr. Dog have been announced as the surprise headliner for this year’s Philly Music Fest. Dr. Dog will lead the citywide bill with two headline performances at Ardmore, Pa.’s Ardmore Music Hall on Sept. 23 and 24. Dog playing Philly Music Fest is a nine-year dream come true. Each year, Dr. Dog is my first email, my first call,” said Greg Seltzer, the event’s producer and founder. Beyond the top billing, Philly Music Fest will feature performances from The Wonder Years, Mt.