Answer: Brihaddeshi
Notes: In post Gupta period, a great treatise only after Natya Shastra was composed in Sanskrit as Brihaddeshi by Matanga Muni. Brihaddeshi is the first text that speaks about raga and distinguishes the music genres into Marga Sangeet (Classical Music) and Desi Sangeet (Folk Music). Brihaddeshi was also the important work on Indian music before the Islam came and influenced the Indian music. Brihaddeshi was based upon the Natya Shastra itself and has clarified many things which were unclear in the Bharata’s text.
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