Are You a Humming Bird?
  Among the many changes some would like to impose on the church is the practice of humming songs rather than singing them. Possibly convinced instrumental music is not authorized, but still wanting something new, sensational, startling, different, some have turned to humming hymns and songs. But where is this taught in Scripture? Oh, it is the verse just before the one that teaches instrumental music, I think. Maybe it's the verse that also authorizes clapping  and ping-pong.

  Singing is to speak, teach and admonish. Humming does not, cannot, do this. So even if it is the sound of the voice, it is not what Scripture teaches is to be done in song. So confine your humming to your morning walk, grocery shopping, or country drive. It has no place in worship.