Scientists studing the phenomenon report that
"collisions between sand grains cause the motions of the grains to
become synchronized. The outer layer of the dune vibrates like the
cone of a loudspeaker. The particular note depends primarily on the
size of the grains."
http://www.nytimes.com/2006/07/25/science/25find.html?8dpc
The scientists found they could re-create the sound in the lab, no
sand dune required.
"Microphones are not ears,
Loudspeakers are not birds,
A listening room is not nature."
Klas Strandberg
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