They sing the song of Moses - That which Moses sang, Exo 15:1, when he and the Israelites, by the miraculous power of God, had got safely through the Red Sea, and saw their enemies all destroyed.
And the song of the Lamb - The same song adapted to the state of the suffering, but now delivered Christians.
Great and marvellous are thy works - God’s works are descriptive of his infinite power and wisdom.
Lord God Almighty - Nearly the same as Jehovah, God of hosts.
Just and true are thy ways - Every step God takes in grace or providence is according to justice, and he carefully accomplishes all his threatenings and all his promises; to this he is bound by his truth.