From Marcelo in the Real World:
"'What's the mental music like?' Dr Malone asks. I stop tying my sneakers so that I can think about his question. But it is impossible to put into words what the internal music is like. (I prefer the word "internal" to the world "mental" when referring to the music. The fact that the IM, as I call it for short, is inside my mind does not necessarily mean that it is produced by my mind) What is the IM like? How many times has Dr. Malone asked me that question and how many times have I not been able to answer it? 'Sweet,' I say. 'It is sweet."