In Hindu culture, the words “ Mantra Sastra” describe the science of sound. There are different mantras to affect the particular parts of the body and the mind. Each mantra is constructed from a combination of sounds which have a definite and predictable effect on the human psyche and body. An obvious example is the difference between classical and rock music. The former tends to relax while the other is inclined to excite the senses. In temples mantras are chanted and very often we feel peaceful after a temple visit. There is a spiritual vibration, which we cannot see, but feel. In pujas , main deity is consecrated thus. Many Kalashas ( pots )are filled with water and mantras are chanted to charge the water with spiritual force. We can understand better by the comparison of a plain wire and charged wire. A plain wire has no power to energize or electrify. If a current is passed through the wire, it beomes charged and is called a “ live” wire. Sound has the effect on water to energize it. This water is poured on the idol to invoke the deity in the form and the idols attain sanctity. Sound therapy is employed on our bodies also. Saura Suktha, a vedic hymn to the sun, if chanted correctly a certain number of times after feeding a diabetic man with plenty of sweets, allows him to sweat profusely and brings down his blood sugar to normal ! Even if Vedic mantras are chanted without understanding their meaning, positive effects are produced on the body. This only shows the power of vedic mantras. But they have to be chanted in the correct meter and the pronounciation has to be perfect. It is best learnt from a qualified teacher and self-learning of vedic mantras is not advisable. The sound of Mantras have a spell-binding effect and a toning impact on the human mind and help achieve mental peace. We ring the bell, as soon as we enter a temple. This gives an auspicious sound and we gain the vision of God who is the personification of auspiciousness. During arathi we ring the bell and in some customs, the conch is blown. This is mainly to drown any inauspicious sound and noises and irrelevant comments made, which is likely to distract the devotee when he is seeking concentration and inner peace. When we perform pujas at home, we perform Ghanta Puja which purifies the atmosphere and removes all negative energy. The following mantra is chanted when ringing the bell; Aagamaartham thu devaanaam gamanaartham thu rakshasaam Kurve ghantaaravam thathra devathaahvaana laanchanam " I ring the bell to mark the invocation of the deity and invite virtuous and noble forces to enter my heart and home. I also mark the departure of destructive and evil forces to depart my heart and home." Sound energy is also used in holistic healing to treat insomnia, fatigue and stress related conditions. Spontaneous healing takes place because of energy synchronization. Chanting casettes and CD s of “ Aum” and other similar mantras nourish our physical, emotional and spiritual being. Love & regards, Chithra.