If you want to be fully convinced of the abominations of slavery, go on a southern plantation, and call yourself a negro trader. Then there will be no concealment; and you will see and hear things that will seem to you impossible among human beings with immortal souls.
So I write melodies - thirty, forty, fifty - then I cast them off until I have just two or three. If only one is needed, I go see the director and ask him to decide.