As [Katy] Perry powers to No. 2 on the Hot 100, Miley Cyrus' "We Can't Stop" drops 2-3 after three nonconsecutive weeks at its No. 2 peak. Still, "Stop" scores a ninth week atop Streaming Songs (6.9 million, down 11%). It slides 3-6 on Digital Songs (148,000, down 6%) but advances 22-18 on Radio Songs (51 million, up 8%).
