The Song of the Ancients is a song in the world of NieR RepliCant and NieR Gestalt (NIER). While the song is in a forgotten language, it is known to tell of an event where a black book sends the world into chaos, and its counterpart, a white book, will defeat its foe with the Sealed Verses and restore peace to the world. Devola and Popola were known to frequently sing it, sometimes together, though the latter less so when she became busy with upholding the Village.
- Though it is sung in what is a forgotten language in the universe of NieR, the song is actually sung in a composite language that takes elements from English, Japanese, Spanish, Portuguese, Italian, and French.
- There are three versions of the song: A version by Devola, a rendition by Popola, and a duet.