'New Song' in the Bible

And they sing a new song, saying, Thou are worthy to take the book and to open the seals of it, because thou were killed and purchased us from God by thy blood, out of every tribe, and tongue, and people, and nation.

And they sing a new song before the throne, and before the four beings and the elders. And none could learn the song except the hundred and forty-four thousand, those who have been redeemed from the earth.