Weezer's "Happy Hour" (Crush) is this week's Most Added song at Modern Rock. Other winners include Bleachers' "I Miss Those Days" (RCA), AJR's "Sober Up" (AJR/BMG), Alice Merton's "No Roots" (Mom & Pop), Franz Ferdinand's "Always Ascending" (Domino) and Killers' "Run For Cover" (Island/Republic).