Nada literally means the vibration or the sound produced with the help of any physical or natural movement of any object in the universe. It can be said as the tendency of sound production by means of collision of any two things which create some vibes and make a sense of hearing a vibration in air called Nada. In Musical terms, a Nada is different then what describes in general context. In Shastra, Nada, a Sound has been mentioned as supreme joy regarded as a creator or the Nadabrahma, the root of creation.
The conceptual meaning of Nada has been explained as Na- means life or the air or Vayu and Da means Agni, Fire or the energy to generate life thus Nada means the expressed sound to create emotions and pleased the ear. In Indian Classical Music we generally describe two types of Nada- Anahat Nada and Ahat Nada. Anahat Nada is unstuck and not caused by any means but self-sounding, and it can be said as the phenomenon of eternal vibration or the aura created by nature. It has no connection with Music and musical genre. Another Nada type is Ahat Nada or the stuck sound created by some means or other.
When the series of Ahat Nada are arranged in ascent and descent with stable frequencies with systematic interval between two Nada creates a Shruti then swar to form a musical melodies. The same characteristics of Nada in Sama Veda were called the Udat, Anudat and Swarit later forms a Shruti and Swar. Nada in Music can be considered as the fundamental essence to nurture the melody.
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