What is the timbre of the Voice of Humanity?

Take thousands of hours of audio which is just voices, accurately representing proportions of men, women, children, races, etc., break it into sections of, say, 10 seconds, and superimpose *all* of them, i.e., add them *all* up to one 10-second clip. May have to do this using a large bit depth and then normalizing to fit into 16-bit samples and/or using compression.

Alternatively get as many possible voices as you can but that are just a sustained vocal sound (like 'carrying a note'), without phonemes.