I don't have a clue really. I think maybe the turrets are smarter than we think and were mourning the 'death' of Caroline? xD There are so many possibilities. I'm really excited to see the next game though now that all those human test subjects have been located.
Spoiler:
There was a few hints in the game that Chell was actually the daughter of Caroline and Cave - One of the hint's being the 'Bring Your Daughter to work day' room
The turret opera, when translated says this
My beautiful dear, my darling beauty!
My baby, oh heavens
That admire her!
That admire her!
Oh my dear, farewell!
My dear child...
Why don't you walk away?
So far, away from Science!
My dear, dear baby...
Ah, my beauty!
Ah, my dear!
Ah, my dear!
Ah, my little girl!
Oh my dearest one!
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