Reading the novel from The Astonishing again, there's this similarity I've been thinking about.
In The Astonishing story Nafaryus wrote this special song with his dad. It ment the world to him at a moment, but with his father not being there for him when he needed him the most, the song was also a painful reminder. He recorded it on his birthday for his dad, who wasn't around (again) and did so as song 237 on the musicplayer. That very afternoon his father - who was the emperor - died due to an ambush by the rebels and therefore Nafaryus decided to hide it from anyone and keep it safe. He hid it in the Hall of Lost Things, not to visit to again. Too painful, the wound was still too fresh and hurts too much. When he became the emperor himself, this was the foundation on deleting any music in the empire.
At any moment his daughter finds it in the Hall of Lost Things, keeps it closely and when see found out - through her mom, Arabelle - about song 237, she's over the moon and treasures it like diamonds. This song is innertwined in her relationship and the love she feels for Gabriel.
And then, an album later on Distance Over Time, there is this strange and spooky Room 137. Lyrically is shows similarity, with phrases like:
"someone is trying, someone is dying, to find out something. Will he reason, what's the message... the key to heaven, 137."
But later on there is also "show me what I cannot find, hidden by design."
Does anyone know if there is consciously layed an easter egg in here, somehow... or am I way off base.