The classical music of India comprises two main schools – Hindustani or North Indian, and Carnatic or South Indian. They freely borrow from each other. The differences in style are, however, clear and anyone with a little familiarity can readily identify a piece as belonging to one or the other school after hearing just a few notes.
The classical music of India is based on an elaborate theory of music spelled out in a comprehensive reference called ‘Natya Shastra’ ascribed to the sage Bharata in the fourth century. This is believed to be a compilation of ideas that were already developed, rather than a new creation.
Music in India gives prominence to melody rather than harmony. Classical performances use very few instruments – normally a percussion instrument to keep the beat, and a string instrument as a background drone to accompany the voice. Unlike western classical music notation in the Indian classical music is rudimentary. Performers do not use written music at all and their renditions have a high element of improvisation. The basic concept underlying classical music is ‘raga’ which is best described as an outline for improvisation. A raga lays down a sequence of notes, which can be different in ascent and descent, and certain key movements that help in building the mood of the raga. Each raga is associated with a time of the day and a mood. Some popular ragas are Yaman, Malkauns, Bageshri, Bihag, Darbari, Bhairavi from the North and Kalyani, Hindolam, Hamsadhwani, Shankarabharanam, Kalawati from the South. Some prominent names in classical music are Ravi Shankar (sitar), Bhimsen Joshi (vocal), Jasraj (vocal), Balamurali Krishna (vocal), Kishori Amonkar(vocal), Amjad Ali Khan (sarod) and Lalgudi Jayaraman (violin).
There is a rich tradition of gharanas (house of music) in Hindustani Classical Music. The gharana concept gained popularity in the 19th century when the royal patronage enjoyed by musicians weakened. Performers were compelled to move to urban centres and to retain their respective identities they fell back on the names of the regions they hailed from. Thus even today the names of many gharanas refer to places. A gharana also indicates a comprehensive musicological ideology; the gift of music is passed down from one generation to another or from the guru or teacher to the shishya or student. Some well-known gharanas of Hindustani classical music are Agra, Gwalior, Kirana, Jaipur, Rampur, Patiala, Delhi, Benaras and Mewati.