Katy Perry's former four-week No. 1 "Dark Horse," featuring Juicy J, departs the bracket (7-11). The song stands as Perry's longest-charting in the top 10, having spent 22 weeks in the region. (Follow-up "Birthday" likewise falls, to No. 22 from its high of No. 17 the past two weeks. Still, "Birthday" bumps 15-14 on Radio Songs, up by 6 percent to 65 million.)