Music has the power to let the heaventh descend on earth. A Raga is far more precise and much richer than a scale or mode, and much less fixed than a pericular tune. A Raga includes many melodies.
The origins of Indian classical music can be found from the oldest of scriptures, part of the Hindu tradition, the Vedas. It is later also significantly influenced by Persian music.
Raga Bhairav is so fundamental to Indian tradition that its impaction on the nation's musical soul can never be overstated. Even the unlettered in the land is familiar with its germ in some form or the other. The overlay of Bhairav strains on an early, bucolic Indian morning affords a purifying experience like no other. Verily, it falls to the lot of the noblest of rAgas, deserving of renewal and reflection in the portals of the mind every single day.
The Samaveda, one of the four Vedas, describes music at length. The Samaveda was created out of Rigveda so that its hymns could be sung as Samagana; this style evolved into jatis and eventually into ragas. Indian classical music has its origins as a meditation tool for attaining self realization. All different forms of these melodies (ragas) are believed to affect various "chakras" (energy centers, or "moods") in the path of the Kundalini. However, there is little mention of these esoteric beliefs in Bharat's Natyashastra, the first treatise laying down the fundamental principles of drama, dance and music.