prelude
in
The Lords of Discipline
(Auto-generated)

something that comes before and prepares for what follows; in music, a short piece that introduces a larger work or stands alone as a brief, expressive piece (often for piano)

In everyday use, a prelude is an event or action that leads up to something more important, like a small disagreement being a prelude to a larger conflict. In music, the word can mean a short opening piece (for example, before an opera scene) or a short, self-contained work, often written for piano or organ, that sets a mood.