Nagasvaravali  , 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).  ' is a symmetric rāgam that does not contain "rishabham" or "nishādam". It is a pentatonic scale ("audava-audava" ragam in Carnatic music classification - "audava" meaning 'of 5'). Its ' structure (ascending and descending scale) is as follows (see "swaras" in Carnatic music for details on below notation and terms): (the notes used in this musical scale are "shadjam, antara gandharam, shuddha madhyamam, panchamam, chathusruti dhaivatam")  "" is considered a "janya" rāgam of "Harikambhoji", the 28th "Melakarta" rāgam, though it can be derived from other melakarta rāgams, "Chakravakam", "Sooryakantam", "Shankarabharanam", "Vagadheeswari" or "Shoolini", by dropping both "rishabham" and "nishādam".  "" rāgam has a few compositions in classical music. This section covers the theoretical and scientific aspect of this rāgam.  "'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".