When we analyze the notes they basically come back down to the 7 basic notes or swar , which are SA,RE,GA,MA,PA,DHA,NI these are also known as SARGAM. There are also slight variations of notes like the komal notes. The notes RE,GA,DHA,NI and these can be taken in their Shudh or Komal forms depending on the raag. A Tivra form is also taken of the swar MA.
Now each of these is the same note; however, taken in a little different tone. So,each raag has a signature combination of notes be it shudh, komal or tivra notes. This combination is reserved for this particular raag only, hence whenever this combination plays the listeners can identify which raag the musician is going to sing/play.
The instrumentalists playing with the singer also become aware of the raag and can play accordingly. This combination is repeated at various times in the raag. The combintion of swars forms kind of like the foundation for the raag.
The combination for each raag is very interesting because there are just so many possible combinations. You can combine shudh notes with Komal notes with TIvra notes. There are just so many combinations which make each raag so unique and beautiful.
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