Daniel 3:5 (ESV)

5 that when you hear the sound of the horn, pipe, lyre, trigon, harp, bagpipe, and every kind of music, you are to fall down and worship the golden image that King Nebuchadnezzar has set up.

The representatives of all the peoples, nations and languages in Nebuchadnezzar’s kingdom are to kneel down before the statue when the music begins to play.  It is the call of the king of Babylon, Peoples of all nations, bow down before me. Worship me as the most powerful ruler of the earth. If you do, your life will be good. Peoples of the world, when the music is playing then praise me as the supreme god. This is what it is all about. This is what Isaiah prophesies about, talking of the exile and the mighty king of Babylon in Isaiah 14:14, when he quotes the king of Babylon saying, I will ascend above the heights of the clouds; I will make myself like the Most High.

Beautiful musical instruments are used here in the service of the worship and the deification of a person and of the state. However splendid the music sounded, it is in the service of God’s great adversary. Good things are often also used in the service of unbelief and the devil and it is not how something sounds that determines its value, but what it is used for.