The musicology
Western music uses 12 equally-spaced semitones per octave (12-TET). Carnatic music does not — it divides each octave into 22 microtonal positions (śrutis), and ragas use specific śruti positions that 12-TET cannot reproduce. This is why a Carnatic singer cannot tune a guitar and sing — the guitar's E♭ is in the wrong place for Bhairavī.
Hover or tap any position
Each svara (Sa, Ri, Ga, Ma, Pa, Dha, Ni) sits at one or more specific śruti positions. Carnatic theory recognises 16 named svaras within the octave — three variants of Ri, three of Ga, two of Ma, three of Dha, three of Ni — and each gets its own śruti. Below: the mapping used in the canonical Sangeet Parijat (Ahobala, c.1665) reference.
Sa
Sa (tonic)
R₁ R₂ R₃
Ri (raised 2nd)
G₁ G₂ G₃
Ga (raised 3rd)
M₁ M₂
Ma (4th / tritone)
P
Pa (perfect 5th)
D₁ D₂ D₃
Dha (raised 6th)
N₁ N₂ N₃
Ni (raised 7th)
The third Ri and the second Ga are the same pitch. A 12-TET keyboard plays them as the same key (D). But in Mayāmāḷavagauḷa (the parent raga of 21 janyas), R₃ is a grace-note approach to G₂ — a singer shades it differently from G₂ even though they occupy the same frequency. Karunattu can use a plain keyboard-semitone readout as a quick orientation aid, but rāga practice grades the note against its 22-śruti swara target.
Mā 2 (the higher Ma) sits at śruti 14 — exactly halfway between Sa (śruti 1) and Pa (śruti 22). In 12-TET, the nearest note is a tritone (augmented 4th), which is dissonant and rarely used. In Carnatic theory, M₂ is a stable, fully consonant note in ragas like Latāṅgi, Sarasāngi, and Citrāmbari. The 22-śruti grid makes the dissonance disappear.