The opening track starts out sparse... every word uttered sounding important. As the song expands (which is really the best word for what it does), a heady ambiance is achieved while the singer's voice becomes more intense. The sound of the track in full swing can be adequately described as "grande". The song"So Long / Either Way" also has a similar progression.
Songs like "Santa Rosa" are pure pop bliss- perfectly mixed, and professionally mastered. A more eclectic bridge on this song makes it stand out among pop songs as un-repetitive and interesting.
Overall their themes paired with the singers voice makes me think of "Death Cab for Cutie"... not in every element, but a similarity can be drawn.
"Plague" by The Eastern Sea is available via their Bandcamp page.