And I saw as it were a sea of glass mingled with fire: and them that had gotten the victory over the beast, and over his image, and over his mark, and over the number of his name, stand on the sea of glass, having the harps of God.

Revelation of John 15:2

This is a precious graphic to me. I relate, even now in this life, to the guitar (harp κιθαρα, kithara,) possession, but more salient are the songs the victorious sing.

And they sing the song of Moses the servant of God, and the song of the Lamb, saying, Great and marvellous are thy works, Lord God Almighty; just and true are thy ways, thou King of saints.

Revelation of John 15:3

Moses’ Song and the Lamb’s Song

That had better be two songs, because Moses and Yeshua are not identical twins. If the song of each is to be related to achievement Moses has a failed and eclipsed law and Lamb has his laid down and retrieved life, guaranteeing salvation to believers, and sealing the promise with the gift of the Holy Spirit.