The Natya Shastra is an ancient Indian treatise on the performing arts, encompassing theatre, dance and music. It was written during the period between 200 BC and 200 AD in classical India and is traditionally attributed to the Sage Bharata.
The Natya Shastra is incredibly wide in its scope. While it primarily deals with stagecraft, it has come to influence music, classical Indian dance, and literature as well. It covers stage design, music, dance, makeup, and virtually every other aspect of stagecraft. It is very important to the history of Indian classical music because it is the only text which gives such detail about the music and instruments of the period. Thus, an argument can be made that the Natya Shastra is the foundation of the fine arts in India. The most authoritative commentary on the Natya Shastra is Abhinavabharati by Abhinavagupta.