Though James Mercer put the Shins on hiatus for five years, it took him no time to pen Port of Morrow’s lead single, a sweet, nostalgia-riddled cheer up for a former (and possibly current) love interest. “I wrote the lyrics in the space of 15 minutes, on the living-room floor,” he told Rolling Stone. But not everything went so smoothly. “I think I jinxed it by calling it ‘Simple Song,’ because it was the most difficult track to get finished.” Musically, it’s complex — the song boasts power pop flourishes and guitar squiggle blasts while Janet Weiss (Wild Flag, Sleater-Kinney) pounds away on drums.