The sound(dhwani)which can be heard by us is known as shruti.But its not necessary that all sound heard are musical.So in music only the shruti which is musical is used.In a Saptak (ie Sa Re Ga Ma Pa Dh Ni)their can be only 22 Shrutis.From 22 shrutis 12 shrutis are selected for 7 Shudh Sur and 5 Vikreet Sur.

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