Alan,
Thanks for the info on human hearing-frequency range..

*Fact remains however*

The wing sounds could not be heard by human ears in the *opinion* of
Michelsen.

Thanks to all which responded.

Sincerely,
Bob Harrison

Ps I have watched many many a waggle dance over the years and have never
heard a sound. I will however try to listen closer. One hardly opens a hive
in spring and summer without observing the waggle dance.
I am taking a doctors stethoscope with me when I go to the bees in about an
hour.
I will also listen for workers piping. Never heard a worker  piping but
slightly over 40 years among the bees  might not be enough time. In my
opinion most queen piping is done when queens are removed from the hive or
caged.