Ten thaats of Hindustani music

Beginner · ~10 min

What is a thaat?

In the early 20th century, the musicologist V. N. Bhatkhande grouped every known Hindustani raga into one of ten scale families, called thaats. Each thaat is defined by which form of each swara it uses — komal, shuddha, or tivra — across all seven scale degrees.

Think of thaats as the alphabet of scales: just ten patterns, but every raga in the tradition can be traced back to one of them.

The ten thaats at a glance

Below, shuddha notes are written with uppercase (S R G M P D N), komal with lowercase (r g d n), and tivra with M'.

#	Thaat	Pattern	Western analog (Sa = C)	Signature raga
1	Bilawal	S R G M P D N	C major	Bilawal, Alhaiya Bilawal
2	Kalyan	S R G M’ P D N	Lydian (#4)	Yaman, Bhupali
3	Khamaj	S R G M P D n	Mixolydian (♭7)	Khamaj, Des
4	Kafi	S R g M P D n	Dorian (♭3 ♭7)	Kafi, Bageshri
5	Asavari	S R g M P d n	Aeolian (natural minor)	Asavari, Darbari Kanada
6	Bhairavi	S r g M P d n	Phrygian (♭2 ♭3 ♭6 ♭7)	Bhairavi
7	Bhairav	S r G M P d N	Double-harmonic minor	Bhairav, Ramkali
8	Todi	S r g M’ P d N	(no exact Western parallel)	Mian ki Todi, Multani
9	Marwa	S r G M’ P D N	(no exact Western parallel)	Marwa, Puriya
10	Purvi	S r G M’ P d N	(no exact Western parallel)	Purvi, Puriya Dhanashri

How to read this table

Each pattern is the ascending scale starting from Sa. The same pattern descends.

Sa and Pa never change — they are the two fixed swaras. The other five (Re, Ga, Ma, Dha, Ni) toggle between two forms each, giving 2⁵ = 32 mathematically possible scales. Bhatkhande selected the ten that had the most active raga families.

A pattern: Bilawal → Bhairavi

If you flatten one swara at a time, you can trace a path through five thaats:

1. Bilawal = C major (no flats)
2. Khamaj = flatten Ni → C Mixolydian
3. Kafi = also flatten Ga → C Dorian
4. Asavari = also flatten Dha → C natural minor
5. Bhairavi = also flatten Re → C Phrygian (all komal except Sa, Ma, Pa)

This single chain covers half the tradition. The remaining five thaats (Kalyan, Bhairav, Todi, Marwa, Purvi) introduce tivra Ma — the sharp fourth — and combine it with various komal swaras to produce the more dramatic raga families.

Why this matters for harmonium players

When you sit at the harmonium and play any seven-note scale, you are playing one of these ten thaats. Recognising the pattern lets you immediately know:

• Which raga family you might be improvising in
• Which swaras to bend for character (komal Re in Bhairav; komal Ga in Kafi)
• Which key combinations to keep your fingers near

A harmonium player who knows their thaats can reproduce the scale of any raga from a one-line description, without needing to look at notation.

Where to go next

• Pick a thaat and learn its lead raga: Yaman (Kalyan), Bhairav (Bhairav), Bhairavi (Bhairavi).
• Study how raga emotion is built on top of scale: Bhupali is in Kalyan thaat but uses only five notes.
• Explore the Western ↔ Sargam converter to translate Western scales into Hindustani thaats and back.

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