Ordinarily a Thaat is a combination of seven Swaras or notes capable of producing Ragas. All the notes played in thaat are in ascending order starting from Sa ending at Ni, whether natural, flat or sharp. There are basically ten thaats in Indian
The Thaat must qualify these three Basic conditions :
1. A Thaat must contain the seven swaras (notes) in the regular form.2. The Shuddha, Komal or Tiura Swaras must appear one 3. It is a mere scale, a combination of notes. It does not essentially need to please the listeners ear.