Nāgasvarāvaḻi, is a rāgam in Carnatic music (musical scale of South Indian classical music). It is an audava rāgam (or owdava, meaning pentatonic scale). It is a janya rāgam (derived scale), as it does not have all the seven swaras (musical notes).
Structure and Lakshana
Nāgasvarāvaḻi scale with shadjam at C
Nāgasvarāvaḻi is a symmetric rāgam that does not contain rishabham or nishādam. It is a pentatonic scale (audava-audava ragam[1][2] in Carnatic music classification - audava meaning 'of 5'). Its ārohaṇa-avarohaṇa structure (ascending and descending scale) is as follows (see swaras in Carnatic music for details on below notation and terms):
This section covers the theoretical and scientific aspect of this rāgam.
Graha bhedam
Nāgasvarāvaḻi's notes when shifted using Graha bhedam, yields another popular pentatonic rāgam, Hamsadhwani. Graha bhedam is the step taken in keeping the relative note frequencies same, while shifting the shadjam to the next note in the rāgam. For more details and illustration of this concept refer Graha bhedam on Hamsadhwani.
Scale similarities
Mohanam is a rāgam which has chathusruthi rishabham in place of the shuddha madhyamam. Its ārohaṇa-avarohaṇa structure is S R2 G3 P D2 S : S D2 P G3 R2 S
Shuddha Saveri is a rāgam which has chathusruthi rishabham in place of the antara gandharam. Its ārohaṇa-avarohaṇa structure is S R2 M1 P D2 S : S D2 P M1 R2 S