This video says about itself:
24 October 2012
These two sand dunes both “sing” when sand rolls down their sides. But they sing quite differently.
See also here.
Singing Sand Dunes Explained: here.
Behind the strange noises of sand dune avalanches.
- More Clues About Singing Sand (science.kqed.org)
- For Tune-Carrying Sand Dunes, the Key Lies in the Grains (livescience.com)
- Why ‘singing’ sand dunes hum certain notes (phys.org)