Naad means 'The essence of all sound', it is a perticular vibration, a fundamental frequency
that comes from one common source or sound current. The sound , which can be used for music is called
naad and the sound which cann't be used for music called noise . The sound that comes in use of Music
with sounds melodious to ears and gives joy to our soul. There are two types of Naad "Ahata" and "Anahata".