for music composition, but rather as a basis for classification of ragas. There is not necessarily strict compliance between a raga and its parent thaat; a raga said to 'belong' to a certain thaat need not allow all the notes of the thaat, and might allow other notes. Thaats are generally accepted to be heptatonic by definition.

The term thaat is also used to refer to the frets of stringed instruments like the sitar and the veena.