If you sing alone in your shrine, the vibrations return to you as a reaction. But in community singing, what you have is not a reaction but a wave of vibrations. They enter into the atmosphere and purify the polluted air.
Sathya Sai BabaGod can be addressed by any name that taste sweet to your tongue or pictured in any form that appeals to your sense of wonder and awe.
Sathya Sai Baba