Dance in India comprises numerous styles of dances, generally classified as classical or folk. As with other aspects of Indian culture, different forms of dances originated in different parts of India, developed according to the local traditions and also imbibed elements from other parts of the country. Sangeet Natya Academy, the national academy for performing arts in India, recognizes eight traditional dances as Indian classical dances, while other sources and scholars recognize more. These have roots in the Sanskrit text Natya Shastra, and the religious performance arts of Hinduism. Folk dances are numerous in number and style and vary according to the local tradition of the respective state, ethnic, or geographic region. Contemporary dances include refined and experimental fusions of classical, folk, and Western forms. Dancing traditions of India have influence not only over the dances in the whole of South Asia, but on the dancing forms of Southeast Asia as well. Dances in Indian films, like Bollywood Dance for Hindi films, are often noted for freeform expression of dance and hold a significant presence in the popular culture of the Indian subcontinent. In India, a command over either of Sanskrit, Tamil, Telugu, Oriya, Meitei (Manipuri), Persian, or Arabic, are highly appreciated and respected for learning dances (most significantly Indian Classical Dances) as dancers could have the tools of these languages to go into the primary material texts. Classical dance is one whose theory, training, means and rationale for expressive practice is documented and traceable to ancient classical texts, particularly the Natya Shastra. Classical Indian dances have historically involved a school or guru-shishya parampara (teacher-disciple tradition) and require studies of the classical texts, physical exercises, and extensive training to systematically synchronize the dance repertoire with underlying play or composition, vocalists and the orchestra.