Jem Aswad Senior Music EditorThe revival of the touring business took another tentative step forward when AEG, the world’s second-largest live-entertainment company, sent a notice to furloughed staffers that they will begin returning to work on April 1.According to an email to staff from AEG CEO Dan Beckerman, the first group of employees who had been furloughed or had reduced hours will begin returning at the top of next month, with a goal of all affected staffers “return[ing] to work at full