[...] OP: That is simultaneously a little depressing and incredibly profound. No voices = no humans, although I'm sure he'll be learning about instruments soon, but on the other hand, think about it: how alien would it be to someone who had only ever heard music through via the human voice? How bizarre would the oboe sound, or the bassoon, or baroque strings!
+1. Kind of. I think. Maybe. (We're not disagreeing). The human voice brings a warmth of contact that no instrument can bring. Instrumentals can be sublime, but when you add a well tuned voice or choir, Ka-blam!, instant identification with the best of intimate human sound!
Although, here's a story~~Shortly after my son was born (months, in fact) when we lived in Massachusetts, where we listened to Morning Pro Musica
with Robert J. Lurtsema every morning without fail, which started every morning, without fail, with bird songs... (our TV reception was always snowier than that in the link, until we got cable... but we listened to Morning Pro Musica on the radio, which was clear enough from Boston...)... on April 1st, Robert played a trick on us, and played whale songs instead of bird songs. I was holding my son in the crook of my arm at the time, and remember the look in my infant son's eyes when he heard the whale songs. His eyes got wide and pensive at the same time, like he had heard that sound, somewhere before. Then, it occurred to me, that that is what life sounds like when you are in the womb. http://youtu.be/xo2bVbDtiX8