Ma’soumeh Dadehbala ( Masume Dadebâlâ; April 10, 1942 – January 20, 1990), known professionally as Hayedeh was an Iranian singer with a contralto vocal range. Known for her wide range of voice, her career spanned over two decades, and she has been widely described as one of the most popular and influential musicians of Iran. On January 20, 1990, the day after a performance at the Casablanca Club, near San Francisco, California, Hayedeh died from a heart attack. She was 47 years old. She had a history of diabetes and hypertension.