Sound produced is in Indian Classical Music terminology is called as Naad. Sound can be of many times. There are many ways of classifying the sound produced.
1. Whether the sound is musically useful or not?
All of us know that we can encounter sound anywhere- in the market place, alongside a river, in the chirping of birds, in an automobile garage or even in a music class. What we need for music is the sound which carries some musical quality. If sound does not have any musical quality, it is musically useless. Music has its interest in sound having musical qualities. If these qualities are not present in sound, we will simply call it noise.
2. Whether the sound is produced out of impact or not?
Now, this is quite an interesting classification. It classifies sound on the basis of the reason which has resulted in the production of that sound. In traditional terminology, it is called as Ahat Naad and Anahat Naad. The sound which is produced by any type of impact is called as Ahat Naad. And the other which is produced out of nothing is called as Anahat Naad. Impact may be of any time. It may be friction as in stringed instruments which are played with bow, impact as in case of drums, wind energy producing sound as in case of strings with reed.
In general, all our music consists of Ahat Naad. The other type is something related with spirituality. It can also be termed as Cosmic Sound. It is considered that by meditating on music, we can get a glimpse of that Soundless Sound.
A Glance at Basics-
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