While discussing on raga choices, we should also keep in mind how there could a western music persective on top of all these raga layers. That makes all our analysis even more inadequate to be able to pass judgements since we are only seeing half the picture. We are not seeing the complete picture at all ! Below are some western scales and their equivalent tamil pann and carnatic ragas: (info courtsey Violin Vicky, Tn Arunagiri, Gopi, Sripathy Ramesh, one Mr. Idiappam from ForumHub. )
First about the names, notations
pAlai = scale = raga
Kural = C = sa
Thutham = D = ri
Kaikilai = E = ga
Uzhai = F = ma
ILi = G = pa
ViLari = A = da
Tharam = B = ni
Ilango adigal in silapadhigaram gives the names of the 7 Major Scales and explains how they are derived - pan peryathal or palai thiripu. Below is how they are derived by tonic shifts.
CempAlai = C to C = Ionian - Diatonic Major = Dheerasankaaabharanam - All White Keys
PadumalaippAlai = D to D = Dorian = Kharaharapriya - All White keys
SevvazhippAlai = E to E = Phrygian = Hanumathodi - All White Keys
ArumpAlai = F to F = Lydian = Mechakalyaani - All White Keys
KOdippAlai = G to G = Mixo-Lydian = Harikaambhoji - All White keys
VilarippAlai = A to A = Aeolian - Diatonic Minor = Natabhairavi - All White Keys
MercempAlai = B to B = Locrian = (non existent in carnatic) - All White Keys -Thodi with Ma2 instead of Pa
Other scale - ragas equivalents
Harmonic Major = Sarasaangi
Harmonic Minor = Keeravani
Melodic Major = Chaarukesi
Melodic minor = Ascending is Gowrimanohari and Descending is Natabhairavi.
Double Harmonic Major = Mayamalawagowlai
Double Harmonic Minor = Simmendhramadhyamam
Major Pentatonic Scale: = Mohanam
Minor Pentatonic Scale: = Sudha Dhanyasi
Blues scale -- Minor Pentatonic with Ma2 --ex: if Sudha dhanyasi is Sa Ga ma Pa Ni Sa. Blues is Sa ga Ma1 Ma2 Pa Ni Sa. Ga and Ni are Eb and Bb in C for example.
Whole Tone Scale is like C D E F# G# A# C in a C shruthi thing for example. The interval between one note and the next note is always a tone(2 semitones).
Chromatic Scale is C C# D D# E F F# G G# A A# B and C. All 12 notes in a scale from C to C for example.
I am not equipped to comment on these western aspects. I am zapped to even know such details exist. Seen in this context, how many more dimensions there are to IR's music ? And how ill-equipped and incomplete would it sound if someone knowing just carnatic or vice versa someone (knowing only western) make reviews on a song !!
While i could a brush aside a natabhairavi song as being cliched, that song may talk a different language to a person knowing western music -- Aeolian - A to A - All White Keys - Natabhairavi !!!