Why do we sing?
The singing voice is without doubt the closest we can be to actual sound: we become as one with its music, and our whole body vibrates to it.
Where does the voice come from, what is it made of?
Birds also sing, and they produce astonishingly percussive sounds from their small bodies.
But we cannot sing as spontaneously as birds, and the objective complexity of classical music prevents singers from depending on nature only.