Didgeridoo players use a technique called 'circular breathing' that allows them to play continuously. Air stored in the cheeks is expelled whilst simultaneously breathing in through the nose. : r/interestingasfuck
Physics of the Didjeridu (Didgeridoo)
How to Make a Bamboo Didgeridoo
Learn to Play the Didgeridoo - Aboriginal Australian Art & Culture
How do didgeridoos work? – How It Works
WoodSlide: All 12 keys in one didgeridoo that you can record and perform with - YouTube