In their early days the Kills were a menacing lo-fi outfit whose sonic dynamic played out onstage. Singer Alison Mosshart and guitarist Jamie Hince would sing to and glare at each other throughout the entire set, barely glancing at the audience, looking like they were on the verge of fighting or fucking at any moment. And as much as the duo has progressed since then, that dynamic remains at the heart of everything it does. The Kills have broadened their horizons considerably since 2008's "Midnight Boom"-Mosshart has made two albums with Jack White's Dead Weather and Hince has gotten reams of tabloid attention via his fiancée Kate Moss. It shows on the band's fourth album, "Blood Pressures." As albums usually are, this one is front-loaded, opening with the triple threat of "Future Starts Slow," the skulking "Satellite" and the throbbing "Heart Is a Beating Drum." But later surprises come in the form of the sweet and Spector-esque "Baby Says" and a pair of ballads. Bluesier and less electronic than its predecessor, "Blood Pressures" is by far the Kills' most accomplished and diverse set yet.