Hindustani music style is mainly found in North India, Pakistan and Bangladesh. It exists in four major forms: Dhrupad, Khyal (or Khayal), Tarana, and the semi-classical Thumri. Dhrupad is ancient, Khyal evolved from it, Thumri evolved from Khyal. Dhrupad (or Dhruvapad), the ancient form described in the Hindu text Natyashastra, is one of the core forms of classical music found all over the Indian subcontinent. The word comes from Dhruva which means immovable and permanent.
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