I had always wanted to record the kritis we had performed earlier on the basis of the ragam, rather than bifurcate it on the basis of the name of the song, composer or even language. That didnt seem very educative since the examinations are structured along those lines and its important to get the theory part correct. *sigh* now the word "theory" != "by rote".

Unless I understand the difference between a N2 and N3 and am able to distinguish that swara in the construction of the swara kalpana, i cant get the raga right, and therein lies the challenge. Classifying songs according to the raga is much more simpler and easier to understand since many songs can share the same raga and yet sound so different. Some brilliant composers literally play around with this aspect, including the language and speed. Teachers dont have the time to teach every song ever composed on a particular raaga, or they may not even know that many songs. So its upto the student to learn various styles, get a good grasp and try to extend their repetoire.

|| What is a RAGA? ||

A raga consists of 7 swarams and the sapta-swarams are :- SA - Shadjam
RI - Rishabham
GA - Gandharam
MA - Madhyamam
PA - Panchamam
DA - Daivatam
NI - Nishadham

Of these swarams, S and P are constant but R, G, D, and N have three variations.

R could be Shudha (R1), Chatusruthi (R2), or Shatsruthi (R3) Rishabham.
G could be Shudha (G1), Sadharna (G2) or Anthara (G3) Gandharam.
D could be Shudha (D1), Chatusruthi (D2)or Shatsruthi (D3) Daivatam.
N could be Shudha (N1), Kaishiki (N2), or Kakali (N3) Nishadham.
|| MELAKARTA RAGAM ||
Any ragam that contains all seven swarams is called a Melakartha Ragam. The 72 Melakarta ragams are all sampoorna ragas which means they have all the 7 swaras in the arohanam and avarohanam. Ragams with less than seven swarams are derived ragas from one of the parent melakarta ragams. Here is a nice chart for calculating the Melakarta ragam.

Janya meaning "derived from" is a set of Janya Ragams derived from the 72 melakarta (sampoorna basic) ragams.