PITCH STRATIFICATION AND MODEL FUNCTIONS OF OCTAVE SCALES (ADVOR) OF THE TANBUR

This article explores the octave scales (advor) of the tanbur as structured modal models of the Tajik-Uzbek tradition with functional centers, stable and unstable steps, microinterval ornamentation, and melodic movement. Using the example of the penta-tetrachord model of the octave scale of the doirai Rost, the article demonstrates the construction of the original (asli) and derivative (faryi) scales on seven pitch levels (tabaqa), their interval organization, and the role of individual scales (davr 1, 2, and 5) in the formation of the modal system of the Shashmaqom cycle. The analysis demonstrates the connection between the vertical (harmonic) and horizontal (melodic-dynamic) aspects of the modal structure and performance practice, emphasizing the importance of octave scales for the intonational integrity of the maqom and the systematic nature of the tanbur scale.