The swaras which are not used …

A raga or raag is a melodic framework for improvisation akin to a melodic mode in Indian classical music. While the rāga is a remarkable and central feature of the classical music tradition, it has no direct translation to concepts in the classical European music tradition. Each rāga is an array of melodic structures with musical motifs, considered in the Indian tradition to have the ability to "colour the mind" and affect the emotions of the audience.

Each rāga provides the musician with a musical framework within which to improvise.[3][6][7] The specific notes within a rāga can be reordered and improvised by the musician. Rāgas range from small rāgas like Bahar and Shahana that are not much more than songs to big rāgas like Malkauns, Darbari and Yaman, which have great scope for improvisation and for which performances can last over an hour. Rāgas may change over time, with an example being Marwa, the primary development of which has gone down to the lower octave compared to the traditionally middle octave. Each rāga traditionally has an emotional significance and symbolic associations such as with season, time and mood. The rāga is considered a means in Indian musical tradition to evoke certain feelings in an audience. Hundreds of rāga are recognized in the classical tradition, of which about 30 are common. Each rāga, state Dorothea E. Hast and others,[clarification needed] has its "own unique melodic personality".