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Vedic hymns are represented in various Chhanda (छंद). Which is sung in which way is determined by Vedic Swara (स्वर) (Vedic accent). In chanting of Vedic hymns, there are following main swara/accent used:
Uddata (उदात्त)
Anuddata (अनुदात्त)
Swarit (स्वरित)
Dheergha Swarita (दीर्घ स्वरित)
Prach...