Credited to MONACA, the Japanese music studio known for the atmospheric soundtracks to the NieR games, Blue Bird is shared online as a short, standalone excerpt rather than a full song. Soundboard users tag it with NieR and blue bird, and it has spread through fan edits, gameplay clips and tribute videos where a brief, recognisable musical cue matters more than a complete track. Its continued use comes from that familiarity: even in fourteen seconds, the melody signals the NieR world and its melancholic tone, making it an easy shorthand for nostalgia, loss and quiet reflection in short-form content.