Although this young British songwriter’s penchant for quick-witted couplets and clever hooks earns comparisons to acoustic guitar charmers like Jason Mraz and Damien Rice, Sheeran’s ability to color outside the lines—some beatboxing here, an unexpected R&B inflection there—gives his debut an inventive sparkle. And though he occasional offers a one-liner of head-over-heels sap, Sheeran’s relaxed charisma makes sentimentality one of his most winning attributes.