A primative musical instrument created and used by the aborigines of
Australia. It's a
wind instrument having only 2 tones, both of which are quite low in frequency.
Most
people have heard the deep resonance of this intrument in the background of movies where it's used to promote an atmosphere appropriate to an Australian outback theme.
The
night was silent except for the mysterious
sound of a diggerydoo whose low pitched
tones could be heard from a distance.