It glorifies God – We express the beauty and wonder of the truth about God to God.
It delights God – “Sing O daughter of Zion, shout aloud…He will take great delight in you…He will rejoice over you with singing.” (Zeph. 3:14-17)
It ushers us into the presence of God - “Let us come before Him with thanksgiving and extol Him with music and song.” (Ps. 95:2)
It transforms the worshiper - Here we experience the truth of what we believe.
It accomplishes spiritual warfare - “From the lips of children and infants you have ordained strength because of your enemies, to silence the foe and the avenger.” (Ps. 8:2)
It demonstrates the reality of God to an unbelieving world - “He put a new song in my mouth, a hymn of praise to our God. Many will see and fear and put their trust in the LORD.” (Ps. 40:3)