Mansour Zalzal

Manṣūr Zalzal al-Ḍārib (died 791 A.D.) (often known as Zalzal; Arabic, منصور زلزل), late 8th century - early 9th century, was a musician and composer of Al-Kufa during the Abbasid era.[1] He contributed musical scales that were later named after him (the Mansouri scale, Arabic,المقياس المنصوري) and introduced positions (intervals) within scales on the fretboard of an oud (neutral 3rd frets, between major 3rd frets and minor third frets), called wasati-zalzal.[2]

Mansour is credited by the Encyclopedia of Islam with making improvements on the design of the barbat lute, which was then called the ūd shabbūt.[1] He was the Teacher of great musician Ishaq al-Mawsili.[2]