2 And
I heard a voice from heaven like the sound of many waters and like the
sound of loud thunder; the voice I heard was like the sound of harpists
playing on their harps, 3 and
they sing a new song before the throne and before the four living
creatures and before the elders. No one could learn that song except the
one hundred forty-four thousand who have been redeemed from the earth.
I think these are beautiful verses. I'm especially intrigued by the beginning of verse three where John says "they sing a new song"; the thought of there being a brand new thing that has not been heard ever before, a completely new creation, as an introduction to a better time, is such a hopeful thought.
The writer at bibleref.com proposes some theories about who these choristers may be, (as not much information is given), and says, "Whoever they are, it is clear they are joyfully welcoming the end of the
tribulation and the commencement of Jesus' reign on earth."