NET

3 and they were singing a new song before the throne and before the four living creatures and the elders. No one was able to learn the song except the 144,000 who had been redeemed from the earth.

Darby

3 and they sing a new song before the throne, and before the four living creatures and the elders. And no one could learn that song save the hundred [and] forty-four thousand who were bought from the earth.

KJV

3 And they sung as it were a new song before the throne, and before the four beasts, and the elders: and no man could learn that song but the hundred [and] forty [and] four thousand, which were redeemed from the earth.