"Indian classical music is principally based on melody and rhythm, not on harmony, counterpoint, chords, modulation and the other basics of Western classical music.
The system of Indian music known as Raga Sangeet can be traced back nearly two thousand years to its origin in the Vedic hymns of the Hindu temples, the fundamental source of all Indian music. Thus, as in Western music, the roots of Indian classical music are religious. To us, music can be a spiritual discipline on the path to self-realisation, for we follow the traditional teaching that sound is God - Nada Brahma: By this process individual consciousness can be elevated to a realm of awareness where the revelation of the true meaning of the universe - its eternal and unchanging essence - can be joyfully experienced. Our ragas are the vehicles by which this essence can be perceived.
The ancient Vedic scriptures teach that there are two types of sound. One is a vibration of ether, the upper or purer air near the celestral realm. This sound is called Anahata Nad or unstruck sound. Sought after by great enlightened yogis, it can only be heard by them. The sound of the universe is the vibration thought by some to be like the music of the spheres that the Greek Pythagoras described in the 6th century B.C. The other sound Ahata Nad or struck sound, is the vibration of air in the lower atmosphere closer to the earth. It is any sound that we hear in nature or man-made sounds, musical and non-musical."