There used to be a custom in ancient times, that instead of using an organ in churches four or five persons with the lips closed used to keep one tone, humming that one tone together. I was most impressed by this, hearing it again in a church in Russia after coming from India. The secret of the continual ringing of the bell practiced by the churches at all times and even up till now, is that it was not only a bell to call people; it was to tune them up to their tone, it was to suggest, "There is a tone going on in you, get yourself tuned to it! "