Read it through once

All through my keys that gave their sounds to a wish of my soul, All through my soul that praised as its wish flowed visibly forth, All through music and me! For think, had I painted the whole, Why, there it had stood, to see, nor the process so wonder-worth. Had I written the same, made verse--still, effect proceeds from cause, Ye know why the forms are fair, ye hear how the tale is told; It is all triumphant art, but art in obedience to laws, Painter and poet are proud, in the artist-list enrolled:--