Oriental Jazz Improvisation - Microtonality and Harmony is a comprehensive comparative study that explores the incorporation of Turkish, Arabic, and North Indian scales and modes into jazz improvisation and modulation. The book includes a multitude of scales and modes from these music cultures, along with their transpositions. These scales and modes are essential for any musician interested in South-Western Asian or North Indian music. Besides, the book delves into numerous scales and modes from other cultures' folk music, such as Greek rebetiko, Bulgarian wedding music, or Jewish music, highlighting parallels and similarities among these diverse music traditions. Each scale and mode is presented in its purest - microtonal - form, including the exact interval values in the particular tuning used in the classical Turkish, Arabic, or North Indian music tradition. Additionally, the basics of the respective music theories are imparted. Further, the genuine scales and modes are transcribed into the equal temperament and several practical techniques are shown how to apply them in a jazz context.