…8When He had taken the book, the four living creatures and the twenty-four elders fell down before the Lamb, each one holding a harp and golden bowls full of incense, which are the prayers of the saints. 9And they sang a new song, saying, "Worthy are You to take the book and to break its seals; for You were slain, and purchased for God with Your blood men from every tribe and tongue and people and nation. (Revelation 5:8-9)
A new song?
In his verse-by-verse exposition of Revelation, Oliver B. Greene says,
There is no song recorded in the book of Genesis. The Patriarchs were men of seriousness and deep thought. The first song on earth of which we have any record, is found in Exodus 15. The deliverance which had been wrought for Israel (Exodus 14) formed the theme and material for the song (Exodus 15:1-19) and the refrain (Exodus 15:21).
The old song is God’s celebrated song of creation (Job 38:7). The song here in Revelation is termed “a new song” because its theme, Redemption, when fully accomplished, will create “all things new.” In the end, all things will be new, all evil and old things as a result of sin will be put down, put away, totally destroyed.
It is the song of Moses and the song of the Lamb (Revelation 15:3). The song celebrates God’s past ways with Israel and His present grace through the Lamb slain. Grand as might have been the song of Israel when sung on the eastern bank of the Red Sea, this song in its character and the occasion when it is sung, is incomparably greater. There is no comparison between the old song of Israel and this new song of Redemption. THE REDEEMED (Jew and Gentile, bond and free, rich and poor) SING OF HIM AND TO HIM! They sing, “Thou art worthy to take the book and to open its seals.”He is so worthy! Sing of His worthiness!
The Spirit Filled Song, devotional by John MacArthur