The Vijayanagara musicological nonet or the Sangitashastra navaratna are a group of nine musicological treatises written during the reign of the Vijayanagara empire. These works are counted among the most important and definitive treatises in Carnatic music theory. Each of these works contributed seminally to the growth of the Carnatic music tradition. These nine works are the Sangitasara by the sage Vidyaranya, Taladipika by Salva Gopa Tippendra, Sangitakalanidhi by Kallinatha, Bhandaru Vittaleshwara's commentary on the Sangita Ratnakara, Bhandaru Lakshminarayana's Sangitasuryodaya, Achyutadevaraya's Talakalabdhi/Talakalavriddhi and the much celebrated Swaramelakalanidhi by Ramamatya.