The Didgeridoo is commonly claimed to be the world's oldest wind instrument. It takes a very specific technique to make a didgeridoo and the Aborigies knew exactly how. 

Firt they looked for a tree of the right shape that had been eaten out by termites. It was then cut down and with a sharp instrument stripped of its bark.

Using possibly a spear the debris was pushed through the hollowed trunk and then hot coals were forced through to kill off any remaining termites and leaves. This also had the effect of sterilising the didgeridoo. Then came the most secret process, the carving or the painting on of the sacred symbols associated with the ceremony about to take place.

The didgeridoo is painted with special Shamanic totem animals that could move between "worlds". For example, A frog can move between the land and the water and a lizard moves between the surface and the underground. After using a didgeridoo for one occasion, it was either destroyed or buried in the mud for use at a later date. This was done to prevent women and uninitiated males from seeing the ritual symbols.

Anyone listening to several didgeridoos will notice that no two sound alike. It's sound is unique and unable to be copied with any modern instrument. The didgeridoo is the most recognised Aboriginal musical instrument and has recently entered the field of contemporary music.