The Archetypical Drone Instrument
Traditionally crafted from hollow eucalyptus branches by Australian Aboriginals, didgeridoos produce deep and resonant drones. Because these instruments are nothing more than fixed length wooden pipes, they only produce a single note. Their strength doesn't come from their ability to play melodies - they can't - but in their capacity to produce constantly changing tones, modulated by the player's lips, tongue, and mouth.
The most prominent feature related to didgeridoo playing is circular breathing: players appear to blow air through their instrument as they don’t ever need to breathe in. In fact, they use their cheeks as an air bag, just like a bagpipe. When they need to take a breath, they use their cheeks to keep pushing air into the instrument, while inhaling fresh air through their nose.
Didgeridoo playing techniques can be varied and rhythmic. This generator plays a steady growling tone, which plays very well along with the other sound generators, and the Tibetan Choir, in particular.