10 Parent Scales or Thaats and Their Parallels in Western Music

We are pretty familiar with the seven basic modes or scales in western music theory, considered useful in composing music. These seven modes are: Ionian, Dorian, Phrygian, Lydian, Mixolydian, Aeolian and Locrian. This post indicates the resemblance of these modes with Indian Ragas. But Before that, I would like to exhibit a chromatic an octave table in both (Indian & Western) disciplines.

Western NotesCC#/Db D#/EbEFF#/GbGG#/AbAA#/BbBC
Indian NotesSrRgGMM’PdhDHniNIS

In the Indian Classical discipline, flat notes are represented in lower case, the sharp note is with apostrophe and natural notes are in upper case. Therefore, there are four flattened notes i.e. komal swaras r,g,dh,ni and one sharp (also termed “teevra“) swara M

‘W’ means whole step and ‘H’ means moving on to half step. All my explanations are in the key of C as it is more approachable and understandable.

1.  Ionian Mode (W-W-H-W-W-W-H)

W  W  H  W   W  W   H
(All natural notes are found in Ionian mode)
C- D- E- F- G- A- B  
Similar to Bilawal Thaat(scale)

This mode is exactly similar to  Bilawal which also consist of all the natural or pure notes : S-R-G-M-P-Dh-Ni

2. Dorian (W-H-W-W-W-H-W)

Western – Similar to  KAFI Thaat
C- D- D#- F- G- A- A#
KafiS- R- g- M- P- Dh- ni

Thaat Kafi consist of all natural seven notes except g and ni. Notes ‘ni’ and ‘g” are flat in this Thaat.

3. Phrygian (H-W-W-W-H-W-W)

Western – Similar to BHAIRAVI ThaatC- C#- D#- F- G- G#- A#
In Bhairavi, notes re, ga, dha ni, are komal or flat.
S- r- g- M- P- dh- ni

4. Lydian (W-W-W-H-W-W)

Western – Similar to  KalyanC- D- E- F#- G- A- B
Kalyan S R G M’ P DHA NI

5. Mixo-lydian (W-W-H-W-W-H-W)

Western : Similar to Thaat KHAMAJC- D- E- F- G- A- A#
KHAMAJS- R- G- M- P- Dh- ni

6. Aeolian (W-H-W-W-H-W-W)

Western – ASAWARI Thaat
C- D- D#- F- G- G#- A#
(as ga,dha, ni swaras are komal (flat))
S- R- g- M- P- dh- ni- SA

7. Locrian (H-W-W-H-W-W-W)

Western – TODI Thaat
C- C#- D#- F- F#- G#- A#
TodiS- r- g- M- m- P- dh- ni

Almost all the notes are used in Locrian and Thaat Todi too.

In this way, these various modes resemble the 10 basic scales or Thaats. These thaats are also considered as parent scales of Ragas and play a vital role in the classification of all the numerous ragas according to day, time, nature, persona in Raag Dhyaan.

Ten Scales Or ‘Thaat’

Ten Parent Scales

There are a total of twelve main pitches (Shruti) in an octave, and to create a musical theme, specific frequencies from those twelve are chosen. These chosen pitches determine whether a song is sad/happy, slow/fast, and so on.

Since melody is prime and central to Indian music, we always look for pitch combinations that offer significant melodic potential. These are called ragas, and we know of about 500 ragas in the Indian Classical tradition.

Ragas | Raga classification

Ragas are classified in various ways. One system is to classify them under Ten Parent Scales, known as “Thaat”. These are similar to modes in ancient Greek music. Unlike ragas, which are more flexible in the number of notes they can include, Parent Scales are always heptatonic and must include one each of the seven notes (swara) – sa, re, ga, ma, pa, dha and ni. Variations arise due to the different variants (natural, flat, or sharp) used.
In Bhatkhande’s system, the basic mode of reference is that which is equivalent to the Western Ionian mode or major scale (called Bilawal thaat in Hindustani classical music). The flattening or sharpening of pitches always occurs with reference to the interval pattern in Bilawal thaat. This is how ten parent scales or Thaats are created. Each thaat contains a different combination of altered (vikrit) and natural (shuddha) notes. In any seven-tone scale (starting with Shadaj, Re, Ga, Dha and Ni can be natural (shuddha, lit. “pure”) or flat (komal, lit. “soft”) but never sharp, whereas the Ma can be natural or sharp (tivra, lit. “fast”) but never flat, making twelve notes as in the Western chromatic scale. The sharp tones are called Tivra Vikrit and flat tones are called Komal Vikrit swara (vikrit, lit. “altered”). Selecting seven tones in ascending order, where Sa and Pa are always natural whereas five other tones (Re, Ga, Ma, Dha and Ni can be present only one of their two possible forms, results in 32 modes which are known as thaats. Out of these thirty-two possibilities, Pt. Vishnu Narayan Bhatkhande ji chose to highlight only ten Thaats or scales.
In effect only heptatonic scales are called thaats. Pandit Bhatkhande ji applied the term thaats only to scales that fulfil the following rules:

  1. A thaat must have seven tones out of the twelve tones [seven natural, four flat (Re, Ga, Dha,Ni), one sharp (Ma)]
  2. The tones must be in ascending sequence: Sa Re Ga Ma Pa Dha Ni.
  3. A thaat cannot contain both the natural and altered versions of a note
  4. A thaat, unlike a raga, does not have separate ascending and descending lines
  5. A thaat has no emotional quality (which ragas, by definition, do have)
  6. Thaats are not sung but the ragas produced from the thaats are sung
    One can arbitrarily designate any pitch as Sa (the tonic) and build the series from there. While all thaats contain seven notes, many ragas (of the audav and shadav type) contain fewer than seven and some use more. A raga need not to use every tone in a given thaat; the assignment is made according to whatever notes the raga does contain
    Note that Thaats only give a rough structure of the raga that gives the ‘Chalan’ or way of singing of the raga.

The Ten Thaats (Scales)

  1. Bilawal: All pure notes
    S R G M P D N
  2. Kalyan: Madyam tivra or the higher variant of Madhyam. Rest are pure notes. S R G M’ P D N
  3. Khamaj: Komal Nishad or Lower variant of Nishad. All other six are pure notes. S R G M P D n
  4. Bhairav: Rishabh and Dhaivat are Komal. Rest are pure.
    S r G M P d N
  5. Kafi: Komal Gandhar and Nishad or the lower variants of Gandhar and Nishad. Rest are pure.
    S R g M P D n
  6. Asavari: Gandhar Dhaivat and Nishad are Komal. Rest are pure notes.
    S R g M P d n
  7. Bhairavi: Rishabh, Gandhar, Dhaivat and Nishad are Komal. Rest are pure.
    S r g M P d n
  8. Marwa: Rishabh Komal and Madhyam Teevra.
    S r G M’ P D N
  9. Poorvi: Rishabh, Dhaivat Komal and Madhyam Teevra.
    S r G M’ P d N
  10. Todi: Rishabh, Gandhar, Dhaivat are Komal and Madhyam Teevra.
    S r g M’ P d N
    PS: Lower case alphabet denotes the lower variants of a specific note eg R – Shudh R
    r- Komal R Teevra M is denoted as M’

The Octave, The Saptak, and The Indian Classical Music

Sapta is a Sanskrit word which means seven. So a saptak in Hindustani music means comprising of seven notes. It is a Sanskrit word for an Octave. In saptak or Octave there are 7 natural or pure notes along with their 5 low and high variants. The sevan pure notes and their 5 variants make 12 in all. If we see roughly, they are only the seven notes with their variants hence the word Saptak.



‘Do’ ‘Re’ ‘Mi’ ‘Fa’ ‘So’ ‘La’ ‘Ti’ – English


‘Sa’ ‘Re’ ‘Ga’ ‘Ma’ ‘Pa’ ‘Dha’ ‘Ni’ – Hindi


Octaves In Indian Classical Music

There are mainly three octaves used in Hindustani classical music.

Madhya Saptak (Middle or the 4th Octave)

This octave starts with C4, the ‘Scientific Pitch‘, termed as the ‘Shadaj‘ or ‘Sa‘ which has frequency of 256Hz.
The notes on the scale after that are placed accordingly.
Middle Ocatve Pure notes are denoted as
Sa, Re, Ga, Ma, Pa, Dha, Ni

Mandra Saptak (lower Octave or the 3rd octave)

In the lower Octave the frequency of notes is 2x lower (1 octave lower) than in the Madhya Saptak (middle octave). While writing these notes in notation, they are denoted bearing a dot below them:

Mandra Saptak Notation

Taar Saptak( Upper or the 5th octave)

Taar Saptak or Upper Octave:
In the upper Octave the frequency of the notes is 2x higher (1 octave higher) than in the Madhya Saptak (middle octave).
In notation these notes are denoted bearing a dot above them:

Taar Saptak Notation

In addition to these Octaves, Indian classical vocalists and instrumentalist use Ati Mandra saptak or the 2nd octave while singing or playing instruments.