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The svara’s main function in Karnatik music is to give us a microcosm of the larger melody. But it cannot do this entirely on its own. It does so through a process of interaction. The svara, acts with other svaras to create smaller melodic units, which in turn define the larger melody. How does a svara, the ‘micro’, express the macro? It does so by representing an aspect of the larger melody, not by its fixity or rootedness, its immobility on a scale, but through its movable nature. Therefore, every svara can move, bounce, slide, glide, shiver or skip. How and to what extent a svara can be expressive depends on the nature of the larger musical identity it is part of and the nature of the other svaras within that macro identity. Svaras in some ways are like cells in a body. The cells (svaras) are determined by the content and function of the tissues (smaller melodic units), yet the larger human being (melody as a whole) is embedded in every cell, within the DNA.
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T.M. Krishna (A Southern Music: Exploring the Karnatik Tradition)