The didgeridoo (or didjeridu) is a wind instrument of the Indigenous Australians of northern Australia. It is sometimes described as a natural wooden trumpet or "drone pipe". Musicologists classify it as an aerophone.
A didgeridoo is usually cylindrical or conical in shape and can measure anywhere from 1 to 3 metres in length with most instruments measuring around 1.2 metres. Generally, the longer the instrument, the lower the pitch or key of the instrument. Keys from D to F♯ are the preferred pitch of traditional Aboriginal players.
There are no reliable sources stating the didgeridoo's exact age, though it is commonly claimed to be the world's oldest wind instrument. Archaeological studies of rock art in Northern Australia suggests that the Aboriginal people of the Kakadu region of the Northern Territory have been using the didgeridoo for about 1500 years, based on the dating of paintings on cave walls and shelters from this period. A clear rock painting in Ginga Wardelirrhmeng from the freshwater period (1500 years ago until the present) shows a didjeridu player and two songmen (source: Journey in Time, George Chaloupka, p. 189).