I let myself go at the beginning and write with an easy mind, but by the time I get to the middle I begin to grow timid and to fear my story will be too long. . . That is why the beginning of my stories is always very promising and looks as though I were starting on a novel, and the middle is huddled and timid, and the end is. . . like fireworks.
Music is not math. It's science. You keep mixing the stuff up until it blows up on you, or it becomes this incredible potion.