Students of Carnatic classical music are taught Mayamalavagowla (melakarta 15), aka the double harmonic major / gypsy major scale, as the default. The introductory exercises for voice and ear training are all in this scale. The scale is as follows:
- Carnatic notation: SR1G3M1PD1N3S', or ShaDaj, shuddha rishabh, antara gandhaar, shuddha madhyam, pancham, shuddha dhaivat, kaakali nishaad, Shadaj
- Hindustani notation: SrGmPdNS', or Sha.Daj, komal riShabh, shuddh ga.ndhaar, shuddh madhyam, pa.ncham, komal dhaivat, shuddh nishaad, Sha.Daj (Bhairav Thaat)
- Western intervals: tonic, minor second, major third, perfect fourth, perfect fifth, minor sixth, major seventh, octave.
If asked to sing just a scale (with no further qualification), Western and North Indian singers would sing a major scale / Bilawal ThaaT. But Carnatic singers would respond with Mayamalavagowla.
When and why did this scale become the default for Carnatic music, as opposed to say Kanakangi (SR1G1M1PD1N1, melakarta 1) or Shankarabharanam (SR2G3M1PD2N3, melakarta 29)? It is somewhat difficult to hit the intervals right because it's a series of half-steps and steps-and-a-half with just one whole tone, the one between the perfect fourth and fifth. Is the thinking that navigating such different intervals builds skill? Or is it chosen on the basis that the second, third, sixth, and seventh are just a half-step away from the tonic and the pure ratios of the fourth, fifth, and octave? Do the standard treatises (such as Venkatamakhin's chaturadaNDiprakaashikaa) opine on the choice of Mayamalavagowla as the default scale?
This was one of the questions asked here, but the answers there focus on a different aspect of that compound question.
