concord, unity, peace, amity, friendship. 2.
consonance, conformity, correspondence, consistency. See symmetry
Harmony, melody in music suggest a combination of sounds from voices or musical instruments. Harmony is the blending of simultaneous sounds of different pitch or quality, making chords: harmony in part singing; harmony between violins and horns.
Melody is the rhythmical combination of successive sounds of various pitch, making up the tune or air: a tuneful melody to accompany cheerful words.