I own 30 albums of didgeridoo...
The sound may be haunting indeed and rooted us through our listening body through the earth core...In a way which even the Wagner tuba is not able to because the circular breathing make it more an event of Nature than a discontinuous playing score with an instrument...
I know that’s not the whole story. The didgeridoo is at least 1,000 years old and is capable of such a variety of sounds, I cannot imagine how music for it can be written as a score. It is played using "circular breathing" where the mouth breathes out while the nose breathes in, The drone effect is modulated by the player "talking", which can sound percussive. For real percussion, it can be beaten with sticks! Magical