all at once

Those ideas that please me I retain in memory, and am accustomed, as I have been told, to hum them to myself ... My subject enlarges itself, becomes methodized and defined, and the whole, though it be long, stands almost complete and finished in my mind, so that I can survey it, like a fine picture or a beautiful statue, at a glance. Nor do I hear in my imagination the parts successively, but I hear them, as it were, all at once. What a delight this is I cannot tell! All this inventing, this producing, takes place in a pleasing lively dream.

-- Mozart, quoted in Before the Gates of Excellence by R.A. Ochse