From Wikipedia:
Music of Azerbaijan builds on folk traditions that reach back nearly 1,000 years.[1] For centuries Azerbaijani music has evolved under the badge ofmonody, producing rhythmically diverse melodies.[2] Azerbaijani music has a branchy mode system, where chromatisation of major and minorscales is of great importance.[2] As is the case also with Arabic and Turkish and even more evidently, much of the musical terminology of Azerbaijani cultures is of Persian origin.[3]