A didgeridoo is a type of musical instrument that, according to western musicological classification, falls into the category of aerophone. It is one of the oldest instruments to date. It consists of a long tube, without finger holes, through which the player blows. It is sometimes fitted with a mouthpiece of beeswax.

Didgeridoos are traditionally made of eucalyptus, but contemporary materials such as PVC piping are used. In traditional situations it is played only by men, usually as an accompaniment to ceremonial or recreational singing, or, much more rarely, as a solo instrument. Skilled players use the technique of circular breathing to achieve a continuous sound, and also employ techniques for inducing multiple harmonic resonances. Although traditionally the instrument was not widespread around the country - it was only used by Aboriginal groups in the most northerly areas - today it is commonly considered the national instrument of the Australian Aborigines by southern peoples and is world-renowned as a unique and iconic instrument.

However, many Northern Aboriginal people continue to strenuously object to its frequent, inappropriate, use by both uninitiated Indigenous people of either gender, and by non-Indigenous Australians. Famous players include Djalu Gurruwiwi, Mark Atkins, William Barton, David Hudson, Joe Geia and Shane Underwood as well as white virtuoso Charlie McMahon.

More Info: en.wikipedia.org