Acidic_Cook wrote:ep·ic (pk)
n.
1. An extended narrative poem in elevated or dignified language, celebrating the feats of a legendary or traditional hero.
2. A literary or dramatic composition that resembles an extended narrative poem celebrating heroic feats.
3. A series of events considered appropriate to an epic: the epic of the Old West.
adj.
1. Of, constituting, having to do with, or suggestive of a literary epic: an epic poem.
2. Surpassing the usual or ordinary, particularly in scope or size: "A vast musical panorama . . . it requires an epic musical understanding to do it justice" (Tim Page).
3. Heroic and impressive in quality: "Here in the courtroom . . . there was more of that epic atmosphere, the extra amperage of a special moment" (Scott Turow).
I believe the most accurate of those in the context of my post just now was definition #2, where the "epic" music is primarily meant to convey an incredibly large-scale event.
EDIT: #2 of the adjective definitions