Carnatic music, is a system of music commonly associated with southern India, including the modern Indian states of Andhra Pradesh, Telangana, Karnataka, Kerala, and Tamil Nadu, as well as Sri Lanka. It is one of two main subgenres of Indian Classical Music that evolved from ancient Hindu traditions, the other being Hindustani music. The main emphasis in Carnatic music is on vocal music; most compositions are written to be sung, and even when played on instruments, they are meant to be performed in gaayaki (singing) style.
Although there are stylistic differences, the basic elements of sruti (the relative musical pitch), swara (the musical sound of a single note), raga (the mode or melodic formulæ), and tala (the rhythmic cycles) form the foundation of improvisation and composition in both Carnatic and Hindustani music. Although improvisation plays an important role, Carnatic music is mainly sung through compositions, especially the kriti (or kirtanam) – a form developed between the 14th and 20th centuries by composers such as Purandara Dasa and the Trinity of Carnatic Music.
Carnatic music is usually performed by a small ensemble of musicians, consisting of a principal performer (usually a vocalist), a melodic accompaniment (usually a violin), a rhythm accompaniment (usually a mridangam), and a tambura. Other typical instruments used in performances may include the ghatam, kanjira, venu flute, veena and chitraveena.
*Text from Wikipedia