A peek behind the curtain: sometimes assembling these chapters is as simple as surveying a specific scene or genre, and sometimes it’s more about capturing a mood. These songs run the gamut from country pop to goth rock to 19th century opera, but there is a gossamer thread that connects them all like a Cloud Atlas tattoo, a blue yearning that can be tied to no particular time, the soaring sadness evoked by the wordless sighs of the Cocteau Twins. Listen, and you’ll understand.