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Perde — the named pitch positions

What a perde is

Established A perde is a named pitch position in the Turkish system. Not a note name in the Western sense — the names carry function and history, and the exact tuning of a perde can shift slightly with context.

Turkish notation writes rast as G by convention. Actual sounding pitch depends on the ahenk (see 03-theory/turkish-vs-arabic.md).

Main octave, ascending from rast

Established Principal perdeler with their conventional written pitches:

PerdeWrittenCommas above rastNotes
RastG0Reference
Nim ZirgüleA♭↓4
ZirgüleA♭5
DügâhA9Karar of Uşşak, Hicaz, Hüseynî, Kürdî
KürdîB♭13
SegâhB♭↑17Neutral third. Karar of Segâh, Hüzzam
BûselikB18
ÇârgâhC22Perfect fourth above rast
Nim HicazD♭26
HicazC♯27
Dik HicazC♯↑28
NevâD31Perfect fifth. Güçlü of many makams
Nim HisarE♭35
HisarE♭↑36
HüseynîE40
AcemF44
EviçF♯↓48Neutral seventh
MahurF♯49
GerdâniyeG53Octave

The comma values are the AEU theoretical positions. Practice Performance deviates, particularly for segâh and eviç.

Below rast

Established

PerdeWrittenCommas below rast
YegâhD22
Hüseynî-aşiranE13
Acem-aşiranF9
IrakF♯↓5
GeveştF♯4

Names ending in -aşiran are the lower-octave forms. Kaba prefixes the octave below that.

Above gerdâniye

Established

PerdeWritten
MuhayyerA
SünbüleB♭
Tiz SegâhB♭↑
Tiz BûselikB
Tiz ÇârgâhC
Tiz NevâD

Tiz = high. Tiz durak generally means the octave above the karar.

Naming logic worth knowing

Established Several perde names come from Persian ordinals counting positions on the instrument: dügâh (2nd), segâh (3rd), çârgâh (4th), pençgâh (5th), şeşgâh (6th), heftgâh (7th). Yegâh is the 1st. This is why the same words appear as both perde names and makam names — the makam is named for where it rests.

Nim = half/lesser, marking a slightly lower variant. Dik = sharp/high, marking a slightly higher one. So nim hicaz < hicaz < dik hicaz, separated by single commas.

Implementation note

Store perde as a first-class entity, not as a label on a pitch:

interface Perde {
  id: string;
  name: string;
  writtenPitch: string;        // 'G', 'B♭'
  commasAboveRast: number;     // AEU theoretical
  practiceRange?: [number, number];  // in commas, where measured
  register: 'kaba' | 'asiran' | 'main' | 'tiz';
}

Makam definitions then reference perde IDs rather than absolute pitches, which is both closer to how the theory works and easier to transpose correctly.

Sources

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