OK, well, I missed it by a couple days -- I was thinking of Memorial Day and what it means... then I thought of this song. Yes' Gates of Delirium is a 20+ minute epic about war: the music begins with tensions building, then erupts into a frenzied battle, then concludes with this hauntingly beautiful portion, Soon... looking forward to the end of all wars. This video is taken from the wonderful Symphonic Yes DVD.
p.s. for anyone unfamiliar with Yes and guitarist Steve Howe, that's a pedal steel that he's playing. It's usually used in country music. Steve plays a wide range of electric and acoustic guitars during a typical concert; the pedal steel is used sparingly, only appearing on a small portion of songs.