InCarnatic music,Neraval also known as Niraval orSahitya Vinyasa is the elaboration and improvisation of melody for a particular line. Usually, just one or two lines of text from the song (from theanupallavi orcharanam part of thekriti) are sung repeatedly, but with improvised elaborations.[1] The part of lyrics is chosen which is self-contained in terms of its meaning and context and has an elegant structure amenable for repetition with variations. In general, such elaboration follow the rhythmic patterns in the original lyrics (talam),[2] and each word in the lines of text stay set within their original place (idam) in thetala cycle,[3] though minor variations that remain faithful to the syllabic patterns of the sahityam are considered fine. The lines are then also played at different levels of speed which can include double speed, triple speed, quadruple speed and evensextuple speed.[4] The neraval is one of the features in the extempore improvisation aspect (Manodharma Sangita) of Carnatic music, and is intended to highlight theRaga bhava effectively. It is usually performed by the more advanced performers.[1]
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Examples of Krithis containing lines best suited for neraval: