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Ma'soumeh Dadehbala (Persian: معصومه ددهبالا; 10 April 1942 – 20 January 1990), better known as Hayedeh (Persian: هایده), was an Iranian classical and pop music vocalist with a contralto vocal range. She was well known for her wide range of voice. She was active for more than two decades, and remains one of the most popular singers of Iran.