Start practicing your British accent: The classic story of the world's most famous nanny, MARY POPPINS, begins its Atlanta engagement at the Fox Theatre. Inspired by the classic 1964 Walt Disney film and stories by P.L. Travers, the stage play is a collaboration of award-winning songwriters, screenwriters and choreographers. With so much expertise coming together to create the show, it's no wonder the musical is close to grossing $400 million worldwide. Through May 16. $19.50-$127. Tues.-Fri., 8 p.m.; Sat., 2 and 8 p.m.; Sun., 1 and 6:30 p.m. 660 Peachtree St. 404-881-2100. www.foxtheatre.org.