'New Song' in the Bible

And they sung a new song, saying, Worthy art thou to take the scroll, and to open the seals of it; for thou wast slain, and hast redeemed us to God by thy blood, out of every tribe, and language, and people, and nation;

And they sang a new song before the throne, and before the four living creatures and the elders: and none could learn the song, unless the one hundred and forty-four thousand who are redeemed from the earth.