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A lot happens in James Blake’s songs, but it’s not just in the notes. He’s keenly mindful of space and how it creates tension within the melodies. Always in the forefront is his voice, a languorous instrument that often trembles to the point of sounding like it’ll crack into a soft cry. It’s the aural equivalent of smoke rings — delicate, graceful, and gone within a few seconds.
After attracting so much attention for recording others’ songs — he had previously covered Joni Mitchell’s “A Case of You” and Feist’s “Limit to Your Love” — Blake was adamant about developing as a songwriter on “Overgrown,” his new sophomore album, which brings him to the House of Blues on Wednesday.