Verses with the word melody in the Old Testament (3 verses):

Isaiah 23:16
Take an harp, go about the city, thou harlot that hast been forgotten; make sweet melody, sing many songs, that thou mayest be remembered.

Isaiah 51:3
For the LORD shall comfort Zion: he will comfort all her waste places; and he will make her wilderness like Eden, and her desert like the garden of the LORD; joy and gladness shall be found therein, thanksgiving, and the voice of melody.

Amos 5:23
Take thou away from me the noise of thy songs; for I will not hear the melody of thy viols.