What is "whalesong"

Usage examples of "whalesong".

Some, like those on the small blue world which was the Singer's secret favorite, could sing most exquisite humpback whalesong and, in time, in many millions of turns of their own yellow sun, could learn to swim the silent sea.

What humans call whalesong, I suspect, could be a very primitive form of just such a language.

If you find yourself losing whalesong, you must surface and get out of the sark immediately.