Indigenous music of Australia comprises the music of the Aboriginal and Torres Strait Islander peoples of Australia, intersecting with their cultural and ceremonial observances, through the millennia of their individual and collective histories to the present day. The traditional forms include many aspects of performance and musical instrumentation that are unique to particular regions or Aboriginal Australian groups; and some elements of musical tradition are common or widespread through much of the Australian continent, and even beyond. The music of the Torres Strait Islanders is related to that of adjacent parts of New Guinea. Music is a vital part of Indigenous Australians' cultural maintenance. In addition to these Indigenous traditions and musical heritage, ever since the 18th-century European colonisation of Australia began, Indigenous Australian musicians and performers have adopted and interpreted many of the imported Western musical styles, often informed by and in combination with traditional instruments and sensibilities. Similarly, non-Indigenous artists and performers have adapted, used and sampled Indigenous Australian styles and instruments in their works. Contemporary musical styles such as rock and roll, country, rap, hip hop and reggae have all featured a variety of notable Indigenous Australian performers. Traditional instruments Didgeridoo 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 Aboriginal Australians 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