"Therefore, as soon as they heard the sound of the horn, flute, zither, lyre, harp and all kinds of music, all the peoples, nations and men of every language fell down and worshiped the image of gold that King Nebuchadnezzar had set up." NIV translation
All of the peoples went along and complied with this order.
"At this time some astrologers came forward and denounced the Jews. They said to King Nebuchadnezzar, 'O king, love forever! You have issued a decree, O king, that everyone who hears the sound of the horn, flute, zither, lyre, harp, pipes and all kinds of music must fall down and worship the image of gold, and that whoever does not fall down and worship will be thrown into a blazing furnace. But there are some Jews whom you have set over the affairs of the province of Babylon - Shadrach, Meshach and Abednego - who pay no attention to you, O king. They neither serve your gods nor worship the image of gold you have set up.'" NIV translation
The wise men of Babylon (Iraq) were jealous of the favor that was shown to Daniel's friends and so they went to the king to accuse them of treason. Their goal was to have them killed and out of the way.
The same type of thing can happen with us, today, as children of God. Many times, people around us can see the favor that God has shown us and get jealous because they do not realize that the same kind of favor is available to them through Jesus Christ.
"Furious with rage, Nebuchadnezzar summoned Shadrach, Meshach, and Abednego. So these men were brought before the king, and Nebuchadnezzar said to them, 'Is it true, Shadrach, Meshach, and Abednego, that you do not serve my gods or worship the image of gold I have set up? Now when you hear the sound of the horn, flute, zither, lyre, harp, pipes and all kinds of music, if you are ready to fall down and worship the image I made, very good. But if you do not worship it, you will be thrown immediately into a blazing furnace. Then what god will be able to rescue you from my hand?'" NIV translation
The king summoned the guys and, because he liked them, he gave them another chance to bow down and commit idolatry. Satan does not change his tactics and so he is using this music to call the people to idolatry. That does not mean that all music instruments are bad and should not be in the church as some would say and practice.