The big screen movie “Burlesque,” a contemporary musical with 12 song-and-dance numbers, centers on a young woman who tries to escape a hollow past and finds it performing in a neo-burlesque club in Los Angeles. Ali (Christina Aguilera) is a small-town girl with a big voice who escapes hardship and an uncertain future to follow her dreams to LA. After stumbling upon The Burlesque Lounge, a majestic but ailing theater that is home to an inspired musical revue, Ali lands a job as a cocktail waitress from Tess (Cher), the club’s proprietor and headliner. Burlesque’s outrageous costumes and bold choreography enrapture the young ingenue, who vows to perform there one day.