Lyrics + translation:

cara bel, cara mia bel (dear beautiful, my beautiful dear) ah mia bambina, oh Chell (ah, my child (feminine), oh Chell) che la stima x2 (that she holds in esteem) e cara mia addio (and goodbye my dear) oh mio bambino caro (oh, my dear child (masculine)) perche non passi lontana, si lontana da scienza? (why not go far away, yes far away from science?) cara x2 mia bambina ah mia bel ah mia cara x2 ah mia bambina ah cara cara mia

You can find these singing turrets in one of the test chambers as well.

I haven't played it yet so I didn't watch the vid, but the massive spoiler warnings deserve an upvote.