Scooby and the gang have their first musical mystery in “Scooby Doo: Music of the Vampire.” It begins when they take a sing-a-long road trip into bayou country to attend the “Vampire-Palooza Festival” – an outdoor fair dedicated to all things Draculian. At first it looks as if they’re in for some fun and lots of Southern snacks, but events soon turn scary when a real live vampire comes to life, bursts from his coffin and threatens all the townsfolk. On top of that, this baritone blood sucker seems intent on taking Daphne as his vampire bride! Could the vampire be a descendant of a famous vampi