Sit at a table and with a pencil or your finger tap upon it a
certain number of times, during which there are irregular intervals,
for example--four taps--interval--two taps--interval--five
taps--interval--one tap.
Now see if the child can reproduce the correct number of taps and
intervals. This can be varied in innumerable ways. For older children
tap a familiar tune and see who can recognize it. Let the winner tap a
tune for the others to recognize.