Hindustani music is based on the raga system. A raga is a melodic scale, consisting of notes from the basic seven known as sa, re, ga, ma pa, dha, and ni. Apart from sa and pa which are constant, the other notes may be in major or minor tone, and this gives rise to innumerable combinations. Ten basic scales or thaats are recognized, and other ragas are considered to have evolved from these. A raga must contain a minimum of five notes.
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