He was committed to a unity of opposites and harmony in the world. The band features both vocal harmony and instrumental accompaniment. Jung emphasized the importance of balance and harmony. The finished interior gave an impression of perfect harmony and balance. Artists placed special emphasis on symmetry, harmony, and balance. Empedocles was the philosopher who connected kairos to the principle of opposites and harmony. "Grace" is the expression in appearance of this harmony. God will reign in perfect harmony forever. He argued that the octave was essential in attaining perfect harmony. Security Safety, harmony, and stability of society, of relationships, and of self. The agreeableness trait reflects individual differences in general concern for social harmony. She plays cello, sings harmony and duets. King explained that her character signified a future of greater racial harmony and cooperation. Behind that is the Hall of Supreme Harmony Square. Wagner's later musical style introduced new ideas in harmony, melodic process (leitmotif) and operatic structure.