Overgrown, James Blake’s second album, is a tender, heart-sore thing. The music itself is soulful, full of yearning and quiet sadness. And that voice. It’s so gentle, soft as a phantom tap on the shoulder and ghost words whispered in the ear. The perfect medium, then, for songs that are as blissful as that sweet, half-light moment when wakefulness is extinguished and you surrender to the Sandman’s embrace. The title track sets the tone. It’s the sort of music that could come with an ‘In Case of Emergency’ sticker – soothing, unhurried, the song as sedative, to be broken out…