Her recording career began in 1949 at the age of twelve , when she changed her stage name to Hibari Misora , which means `` lark in the beautiful sky , '' and starred in the film Nodojiman-kyô jidai ( のど自慢狂時代 ? )
Her recording career began in 1949 at the age of twelve , when she changed her stage-name to Hibari Misora ( 美空ひばり , Misora Hibari ? )