Hindustani classical is the Hindustani or North Indian style of Indian classical music found throughout the northern Indian subcontinent. The style is sometimes called North Indian classical music or ShāstriyaSangīt. It is a tradition that originated in Vedic ritual chants and has been evolving since the 12th century CE, primarily in what is now North India and Pakistan, and to some extent in Bangladesh, Nepal and Afghanistan. Today, it is one of the two subgenres of Indian classical music, the other being Carnatic music, the classical tradition of South India.
For more info – http://en.wikipedia.org/wiki/Hindustani_classical_music