Dies Irae is a medieval Latin sequence traditionally attributed to Thomas of Celano in the thirteenth century and sung as part of the Catholic Requiem Mass for the dead, describing the Day of Judgement. Composers including Mozart, Verdi and Berlioz later quoted its melody in their own requiems and symphonic works, carrying it from church into concert halls and then film scores. That long association with death and judgement explains why editors still reach for it today, instantly signalling doom without needing any explanation.