This page documents the exact educational pitch-collection model implemented by Persian Music Scales.
Numerical representation
Degree
Cents from tonic
Circle angle
1
0
0°
2
150
45°
3
400
120°
4
500
150°
5
700
210°
6
850
255°
7
1100
330°
Successive intervals
150 – 250 – 100 – 200 – 150 – 250 – 100 cents
Model limitation
This is the app's pitch-collection model, not a complete definition of a dastgah, avaz or gusheh. Modal identity can also depend on melodic hierarchy, finalis, shahed, characteristic phrases, variable tones, modulation, context and performance practice.