Construction
Step pattern (W = whole step, H = half step, A = augmented second, 3 half steps): H-A-H-H-W-A-H.
Formula (intervals from the root): 1-b2-3-4-b5-b6-7
This seven-note scale shares its b2 and natural 3 with Phrygian Dominant (the 5th mode of harmonic minor: 1-b2-3-4-5-b6-b7) but diverges at two points: Persian has b5 where Phrygian Dominant has a natural 5, and a major 7 where Phrygian Dominant has b7. Those two differences shift the scale from dominant function into something unstable and distinctly non-Western.
Origin and Relationships
- Family: Exotic/synthetic. A synthetic scale with no standard parent derivation. The formula combines Phrygian Dominant elements (b2, 3) with b5 and major 7, producing a scale that belongs to no Western modal family.
- Cultural note: The name is a Western label -- traditional Persian music uses the dastgah modal system with microtonal intervals that equal temperament cannot reproduce.
- Two augmented seconds: b2 to 3 and b6 to 7. These paired leaps give the scale its intense, ornamental character and connect it sonically to Middle Eastern and Central Asian melodic traditions.
Harmonic Context
In Roman numeral analysis (uppercase = major, lowercase = minor):
Imaj7b5(a major 7th chord with a diminished 5th: 1-3-b5-7): The chord built on the root. Neither standard major nor minor, it captures the scale's ambiguous identity.- Drone-based: The b5 disrupts triadic harmony, so the scale works best over a sustained root drone rather than chord progressions.
- Modal color: Treat it as pure melodic material. Functional resolution is not the point -- tension and ornamentation are.
Characteristic Tones
The intervals that give this scale its distinctive sound:
- b5 (diminished fifth): The tone that separates Persian from Phrygian Dominant. It eliminates stable dominant function and pushes the scale toward dissonance and ambiguity. While Persian shares the b2-3 pairing with the Phrygian Dominant family, the b5 marks it as a fundamentally different structure.
- 7 (major seventh): Where Phrygian Dominant has b7 for dominant pull, Persian's major 7 creates a leading tone with classical resolution character -- an unexpected pairing with the b2.
- b2 (minor second): Combined with the natural 3, it produces the augmented second leap that Western listeners associate with Middle Eastern melody.
Melodic Applications
The b2-to-3 augmented second is the melodic hook -- use it to establish the scale's identity, then let the b5 and 7 create tension against the drone. Over a sustained root, the 3-to-b5 movement (two half steps of tightening chromaticism) is where Persian sounds most like itself. Ornamental turns around the b2 and b6 mirror the embellishments found in Middle Eastern and Central Asian traditions.
Practice Seeds
The augmented seconds. Play b2 to 3 and b6 to 7 as isolated pairs, ascending and descending. Internalize the two intervals that define the scale's ornamental intensity.
Drone improvisation. Improvise over a sustained root, letting each degree land against the drone. Hear how the b5 and 7 create contrasting pulls -- one destabilizes, the other resolves.
Persian vs. Phrygian Dominant. Play both scales from the same root, stopping on the 5th and 7th degrees to hear b5 vs. 5 and 7 vs. b7. Distinguish these two b2-and-3 scales by the exact tones that separate them.
Ornamental phrases. Build short melodic turns around b2 and b6, using grace notes and quick direction changes. Develop the embellished phrasing style that suits the scale's non-Western character.