The music sounds serene with spongy guitar and angelic backing vocals when Interpol frontman Paul Banks sings, “This mirror weighs a ton, but at least we act sudden” with staccato conviction. That turn of phrase, which gives both the band’s eighth album and lead track its title, This Mirror Weighs a Ton , frankly doesn’t make a whole lot of sense, and that’s sort of the point since Banks came up with it while improvising the melodies and vocals simultaneously. It’s highly refined automatic