Sing to the LORD a new song, Sing His praise from the end of the earth! You who go down to the sea, and all that is in it. You islands, and those who dwell on them. (Isaiah 42:10)

Sing . . . a new song, his praise. This “new song” never before sung, called for by new manifestations of God’s grace, will match the newness of conditions created by the Servant’s work of redemption in the kingdom, for which earth’s inhabitants will also sing “his praise.” (John MacArthur)

Now, this being the new thing which God declares, the newness of the song which is to be sung on this occasion is this, that whereas, before, the songs of the Lord were very much confined to the temple at Jerusalem (David’s psalms were in the language of the Jews only, and sung by them in their own country only; for, when they were in a strange land, they hung their harps on the willow-trees and could not sing the Lord’s song, as we find, (Psalm 137:2-4), now the songs of holy joy and praise shall be sung all the world over. The Gentile nations shall share equally with the Jews in New Testament blessings, and therefore shall join in New Testament praises and acts of worship. There shall be churches set up in Gentile nations and they shall sing a new song. (Matthew Henry)