Musical Mathematical Ratios and the Engineering of Consciousness – Alexandre Tannous – Free Your Mind Conference 3 (2015-04)

Half-step has 100 cents. Western octave is 12 half-steps (tones, notes: C, C#, D, etc. Black and white keys on keyboard) Indian octave has 22 tones Persian and Arabic octave has 24 tones Turkish octave has 53 steps https://www.youtube.com/watch?v=u-rIRML75_I&list=PLfi4BBtYUMKz36guaSbV8F0I8gosT7eIw