It really is a very odd business that all of us, to varying degrees, have music in our heads.
Oliver SacksGiven her deafness, the auditory part of the brain, deprived of its usual input, had started to generate a spontaneous activity of its own, and this took the form of musical hallucinations, mostly musical memories from her earlier life. The brain needed to stay incessantly active, and if it was not getting its usual stimulation..., it would create its own stimulation in the form of hallucinations.
Oliver SacksDangerously wellโโ what an irony is this: it expresses precisely the doubleness, the paradox, of feeling โtoo well
Oliver Sacks