Ponykind was no stranger to the sudden spontaneous song, the magic of Harmony permeated Equestria like radiation permeated Chernobyl. But this felt different. It was not a hopeful or optimistic tune. It was a song of hardship and toil, and yet so full of pride and longing. He was singing his goodbye to home. Dangerous and flawed, much like himself, it was still his home. Celestia became intimately aware she was witnessing a significant event. Even if the human himself did not know it. A new chapter of his life was laid before him. But moving on meant leaving parts of himself behind.