What is "pipings"

Usage examples of "pipings".

And so they had, and in time this had developed into the overlying pattern of trills and pipings, beneath which, however, the essential structure persisted.

And finally this last deep vibration burst into hearing as a vast drone, hummed up and up into swift tingling tempest of crystalline brittle notes, and still ascending passed into shrill high pipings, and continued again unheard, as had the prelude to the droning.

Drones groomed Her, uttering soft, distressed pipings, that shrilled away into higher ranges.