"Summer is exhausting me with its exhaust fumes and empty promises." Jens Lekman's new album is called I Know What Love Isn't, and its first single "Erica America" is true to that title: meet Jens 2K12, an elegant and articulate bummed-out human. When Lekman showed showed up at Williamsburg's McCarren Park for his Northside set two Saturdays ago, he had ...