There's a pleasing contradiction at the heart of James Blake's new album, the much discussed "Assume Form". Lyrically, it's a weighty affair, with Blake musing on mental health and other serious issues. His distinctively emotive delivery remains heart aching and poignant, making each of Blake's utterances sound like they're shot through with genuine sadness. Yet musically, "Assume Form" is surprisingly chipper by the artist's usual downbeat standards, offering a blend of chunky R&B beats, swirling strings, memorable piano lines, crystalline melodies and glassy electronics. It's this fusion of darkness and light that makes it such a rewarding listen, and arguably Blake's most well rounded LP to date.