You feel the music needs something but you don't know what. So you start searching, fitting, measuring, trying. Every time you try another angle. And sometimes that's frustrating, especially if you don't come up with something for three days.
Human relations are built on feeling, not on reason or knowledge. And feeling is not an exact science; like all spiritual qualities, it has the vagueness of greatness about it.
Of what does politics consist except the making of imperfect decisions, many of them unjust and quite a few of them deadly?