Katy Perry and Imagine Dragons have each gotten some good news courtesy of Billboard'sHot 100 singles chart.
Perry’s “Dark Horse” featuring Juicy J. enters its fourth week at number-one. It's Katy's ninth chart-topper, but the first for Juicy J.
Imagine Dragons aren't in the Top 20, but they have a more impressive stat to celebrate. By checking in at number-26, "Radioactive" has been on the Hot 100 chart for 77 weeks, a new record. Jason Mraz's 2008 hit "I'm Yours” previously held the mark. But the distinction could be short-lived -- Awolnation are just behind them at 76 weeks with "Sail," and they're still on the charts, too.