The didgeridoo is a unique wind instrument developed by Indigenous Australians in northern Australia at least 1,000 years ago. Traditionally, it is made from eucalyptus branches that have been naturally hollowed out by termites. The player uses a technique known as circular breathing—inhaling through the nose while simultaneously expelling air from the cheeks into the instrument—to produce a continuous, droning sound. The pitch is determined by the length and diameter of the wood, and the player can create complex rhythms and vocalizations that mimic the sounds of local animals like the dingo or kookaburra. Beyond music, the didgeridoo holds deep ceremonial and spiritual significance in Aboriginal culture. Interestingly, modern studies have suggested that playing the didgeridoo can help treat sleep apnea because it strengthens the muscles of the upper airway.