Masoumeh Dadeh Bala (April 11, 1931 - December 20, 1989), known as Hayedeh, was Iranian. During his twenty years of activity, he became famous among the people for his opera and alto voice, and he is known as one of the most prominent and influential Iranians. Hayedeh died of a heart attack on January 20, 1990, the day after the performance. He had high blood pressure and diabetes.