This rhythm has also a great deal to do with the rhythm of man's life. There are certain kinds of sound which irritate man and have a bad effect upon the nerves, and there are other kinds of rhythm which have a soothing, healing and comforting effect upon the mind. Music is sound and rhythm, and when sound and rhythm are understood in their nature and character, then music is not only something used as a pastime, but then music will become a source of healing and upliftment.