The Song of Moses and the lamb. It is the deliverance song that the saints will sing from the curse of sin. It is the reality (i.e. the anti-type) to the story where the Israelites sing after they have been delivered out of Egypt from Pharaoh's hands (Exodus 15:1-18). This story - true story - I believe is a type (symbol) of what will happen when all of the righteous are delivered out of the spiritual Egypt/Babylon of this world - at the end of the world: from the Pharaoh of this world - which is Satan himself and his ugly demonic hordes henchmen.