The Didjeridu (or didgeridoo) is an indigenous Australian instrument otherwise known as “drone pipe” or “yidaki”. It is a long (1 to 3 metres) cylindrical piece of wood - usually eucalyptus branches - from which termites ate out the core. The instrument is played with continuously vibrating lips, and requires a constant flow of air. This involves special techniques to inhale air through the nose and at the same time exhale through the mouth, with optional simultaneous vocalization. Good players can play continuously for over 40 minutes!