Mark Kozelek's work as Sun Kil Moon tends to linger over the same baseline elements: stark acoustic instrumentation, conversational lyrics, an eye for heartbreaking detail. But there are fascinating departures, like the synth-pop of “The Greatest Conversation Ever in the History of the Universe” or the lush strings backing “Last Tide.” In contrast, “Sunshine in Chicago” is more plaintive than ever, unspooling melancholy yarns over muted fingerpicking.