mansour

Mansour Zalzal (Arabic,منصور زلزل),late 700s - early 800s was an Arab Musician and composer of Al-Kufa during the Abbasid era. Contributed musical scales that were later named after him (the Mansouri scale,Arabic,المقياس المنصوري) and introduced positions (intervals) within scales such as the wasati-zalzal.Wikipedia