On Tuesday morning, 9/20/2022 ,in the Department of English at the College of Arts at the University of Basrah a master thesis entitled ( Vocal harmony in the Holy Quran: a differential study ) was discussed.

The thesis presented by the student Amina Hamid Nasser included five chapters .The first chapter discussed a general preface, the second chapter included the theoretical aspect, the third chapter discussed the vocal harmony in the Holy Quran, and the fourth chapter dealt with a differential analysis of the vocal harmony in the Holy Quran, and the fifth chapter dealt with the conclusion.

The thesis aims to shed light on the phenomenon of vocal harmony as one of the manifestations of symmetry between the sounds and the spaced silences in the classical Arabic language represented by the Quranic vocabulary, and description and analysis of the sample of Qur'anic vocabulary selected according to the differential theory, as it distinguishes between consistent and inconsistent vocabulary. 

The thesis concluded that the phenomenon of vocal harmony is prominent in classical Arabic, especially in the vocabulary of the Holy Quran, as the sounds and silences that are similar to each other correspond in a certain way to show an aspect of vocal harmony The study confirms that the proportion of consistency in the sounds is higher than the proportion of consistency in the silences. The study demonstrates the validity of the differential theory in analyzing and giving accurate results.