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Isai (transl. Music) is a 2015 Indian Tamil-language musical thriller film written, directed and composed by S. J. Suryah, who starred himself in the lead role alongside Sathyaraj and Sulagna Panigrahi in her film debut. The film marked Suryah's return to direction after a five-year hiatus since 2010, and also his debut as a music director. The film revolves around the rivalry between Vetriselvan, an established veteran composer and A. K. Shiva, his assistant and an emerging composer in the film industry.