Myron Johnson came of age in the disco era. His new show for Ballet of the Dolls, Born to be Alive, is a dance-laden piece of musical history as seen through Johnson’s eyes. 3-Minute Egg went to Thursday’s performance and spoke with Johnson about his motivation for casting a new light on a bygone era and how he stays inspired after 23 years of leading his Dolls. Performances continue through Sunday at the Ritz Theater.