'New Song' in the Bible

And they sing a new song, saying, "Worthy art Thou to take the book, and to open its seals; because Thou wast slain, and didst redeem to God, by Thy blood, some of every tribe, and tongue, and people, and nation;

And they sing as it were a new song before the throne, and before the four living creatures and the elders; and no one was able to learn the song, except the hundred and forty-four thousand, who had been purchased out of the earth.