Trinity of Carnatic music
The Trinity of Carnatic Music, also known as the Three Jewels of Carnatic Music, refers to the outstanding trio of composer-musicians of Carnatic music in the 18th century—Tyagaraja, Muthuswami Dikshitar, and Syama Sastri. Prolific in composition, the Trinity of Carnatic music is known for creating a new era in the history of carnatic music by bringing about a noticeable change in what was the existing carnatic music tradition.
Source: Wikipedia — Trinity of Carnatic music (CC BY-SA 4.0)