Joy is the perception of beauty, unlike happiness, which is because of something. Joy is singing of the heart, a feeling of praise.
In our soul's Magnificat, we become conscious of the cosmos with us. We hear the music of peace, we hear the music of cooperation, we hear the music of love. In our soul's forgetting, we become unconscious of our cosmic birthright, plighted with disharmony, disunity, torn asunder from the stars.