What is a Thaat?

A thaat is a parent scale in Hindustani classical music that serves as a framework for generating ragas. It consists of seven notes (swaras) arranged in a specific sequence: Sa, Re, Ga, Ma, Pa, Dha, and Ni. These parent scales are fundamental to the organization and classification of ragas in North Indian classical music.

Historical Development

The 72 Thaat Theory

In the 17th century, Pandit Vyankatmakhi introduced a groundbreaking theoretical framework in his treatise “Chaturdandi Prakashika.” He systematically analyzed the possible combinations of the twelve musical notes (7 natural + 5 altered) (Sa, Komal Re, Re, Komal Ga, Ga, Ma, Tivra ma, Pa, Komal Dha, Dha, Komal Ni, Ni) and established that 72 distinct thaats could be mathematically derived. From these, 19 were initially selected as practical scales, and eventually, the Hindustani classical system adopted 10 primary thaats. In Surtaal app, you can practice alankars in all the primary thaats.

Mathematical Derivation Process

1. Base sequence: Sa, Komal Re, Re, Komal Ga, Ga, Ma, Tivra ma, Pa, Komal Dha, Dha, Komal Ni, Ni
2. Division into two parts:

• First half: Sa, Komal Re, Re, Komal Ga, Ga, Ma
• Second half: Pa, Komal Dha, Dha, Komal Ni, Ni

1. Creation of 36 combinations using Shuddha Ma
2. Another 36 combinations using Tivra Ma
   Total: 72 possible thaats

Essential Characteristics of Thaats

Completeness

• Must contain all seven notes
• Notes must be in serial order (Sa to Sa*)

Structure

• Only uses ascending pattern (Aroha)
• Can include consecutive variants of the same note
• May not necessarily sound melodious

Relationship with Ragas

• Thaats are derived from major ragas
• Unlike ragas, thaats are not meant for performance
• Serve as theoretical frameworks only

Differences between Thaat and Raga

Thaat	Raga
Must have 7 notes	Can have 5-7 notes
Notes must be in sequence	Notes can be in any order
Has only ascending pattern	Has both ascending and descending patterns
May not sound pleasing	Must be aesthetically pleasing
Theoretical framework	Performed composition

The 10 Primary Thaats and Their Characteristics

1. Bilawal Thaat

• Nature: All natural notes (Shuddha swaras)
• Sa, Re, Ga, Ma, Pa, Dha, Ni
• Character: Foundation of all thaats
• Key Ragas: Deskar, Haunsdhwani
• Time: Morning ragas

2. Khamaj Thaat

• Distinguishing Feature: Komal Nishad
• 
• Character: Romantic (Shringar Ras)
• Key Ragas: Rageshree, Jhinjhoti, Des
• Special Use: Common in light classical forms

3. Kafi Thaat

• Key Notes: Komal Gandhar, Komal Nishad:
• 
• Historical Significance: One of the oldest scales
• Key Ragas: Dhanashree, Bhimpalasi, Pilu
• Time: Late evening

4. Asavari Thaat

• Distinguishing Feature: Adds Komal Dhaivat to Kafi
• 
• Mood: Renunciation and pathos
• Key Ragas: Darbari, Jaunpuri
• Time: Late morning

5. Bhairavi Thaat

• Structure: All komal swaras (except Sa, Pa):
• 
• Character: Devotional and comprehensive
• Key Ragas: Malkauns, Bilaskhani Todi
• Time: Early morning

6. Bhairav Thaat

• Key Notes: Komal Rishabh, Komal Dhaivat
• 
• Character: Masculine, ascetic
• Key Ragas: Ramkali, Jogiya
• Time: Early morning

7. Kalyan Thaat

• Distinguishing Feature: Tivra Madhyam
• 
• Character: Auspicious, blessing-seeking
• Key Ragas: Yaman, Bhupali
• Time: Evening

8. Marwa Thaat

• Structure: Kalyan + Komal Rishabh
• 
• Character: Mysterious, twilight mood
• Key Ragas: Marwa, Puriya
• Time: Sunset

9. Poorvi Thaat

• Structure: Marwa + Komal Dhaivat
• 
• Character: Serious, mysterious
• Key Ragas: Puriya Dhanashree, Shree
• Time: Sunset

10. Todi Thaat

• Status: Considered the king of thaats
• 
• Character: Devotional, gentle
• Key Ragas: Miyan Ki Todi, Gujari Todi
• Time: Late morning

Practical Application

Thaats serve as a theoretical framework for:

• Classifying ragas
• Understanding relationships between different ragas
• Learning new ragas systematically
• Composing new melodies within traditional frameworks

Note on Modern Usage

While the thaat system has replaced the ancient Murchanna system, it remains primarily theoretical. Modern performers use it as a reference point rather than a strict rule system, allowing for creative interpretations while maintaining traditional foundations.