The music in Australia is one of the things I will always remember about this country.
(I'm a musician myself and have always considered music to be one of the simple joys of life). I don't think I'll ever forget the sounds of the Australian Didgeridoo's. We heard them many times as we traveled along the coast.
I'd have to agree (as Aborigine's do) that the Didgeridoo's do MORE than just express music. (sounds like I'm shearing sheep again).
I found them to have a "magical quality" as I listened to them in the hands of an expert. The Aborigines consider them "sacred" because of the unique 'tonal' qualities the instrument. Most tribes only allow the men to play the Didgeridoo's.
When looking for the wood to make these instruments, it's necessary to 'rap' the tree with a stick. When you hear the 'hollow' sound of the wood, you've got the right tree. (it's caused by termites). They eat the "center of the trees" and leave a resonant structure which produces the didgeridoo's unique qualities.
Tree's cut at different lengths produce varying 'pitches'. Bee's wax is used to create a mouthpiece on the end of the instrument. So much for the technical side.....
A good player can produce sounds from this instrument for as long as an hour by using a technique called "circular breathing". He actually (I know this sounds contradictory) exhales air from his lungs and inhales 'in' through his 'nose' at the same time! This takes a LOT of practice and sounds impossible to most people.
You never want to find yourself on the receiving end of one of these. They're very deadly and very accurate!