First recorded in 2214 by Sable Yuen-Abara, a Tier 2 parent and part-time musician who originally composed the song for her own daughter — born with a congenital heart condition corrected by a chrome implant at four months old — 'Soft Light, Hard Ceiling (Sleep Now, Little Chrome)' has become the most widely known lullaby in GLMZ for a generation of children growing up with augmentation as a fact of life from birth. The song addresses a child who has chrome, who has been repaired, who glows faintly at the sternum where the implant sits, and tells them that the light is beautiful, that the repair is not a shame, that the ceiling of the tier they were born into is real but they are more real. It is tender and clear-eyed simultaneously, refusing to pretend the world is better than it is while insisting the child in it is worth everything.

The melody draws on Vietnamese lullaby tradition combined with a pentatonic structure from the Yoruba lullaby canon, and it sits in a register that is easy for tired parents to sing at any pitch without training. The lyrics shift naturally between English and a soft Meridian creole that most Circuit and Shelf families speak at home. In the years since its release, the song has been covered hundreds of times — in Spire nurseries by professional singers, in Shelf apartments by parents who learned it from a data chip, in pediatric augmentation wards by nurses who play it during recovery. It is one of the few songs that genuinely crosses tier lines without losing itself in the translation.