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'Dark Horse (feat. Juicy J)' tops the Billboard Hot 100 for a second week

Katy Perry’s “Dark Horse,” featuring Juicy J, tallies a second week at No. 1 on the Billboard Hot 100, while Beyonce’s “Drunk in Love,” featuring Jay Z, rockets to No. 2. Plus, Pharrell continues his winning ways as “Happy” hikes into the top 10.

Like every Wednesday, let’s dig in to the numbers behind the Hot 100’s top 10.

After ascending to the summit last week, Perry’s ninth Hot 100 No. 1 (and Juicy J’s first) gains in all metrics. With Perry having performed the track on the Grammy Awards, broadcast on CBS on Jan. 26, the song benefits from a full week of post-Grammy buzz, showing sizable gains in sales and streaming. “Horse” tops Digital Songs with a 27% rise to 373,000 downloads sold, according to Nielsen SoundScan (its best weekly sum), and the subscription services-based On-Demand Songs chart (3.2 million U.S. streams, up 28%, according to Nielsen BDS) for a third week each. It slips 1-3 after a week atop Streaming Songs, but with a 34% gain to 7.5 million. (The song’s momentum in streaming could surge once its video is released; Capitol Records has confirmed that Perry is in the process of filming it.)

On Radio Songs, “Horse” trots 4-3 with 119 million all-format audience impressions, up 18%, according to BDS.

“This No. 1 is the most unexpected one I’ve ever had,” Perry told Billboard upon the song’s coronation last week. “‘Dark Horse’ has been a dark horse of a song, since August when the KatyCats voted to release it early on iTunes, before 'PRISM' even came out. "I’m so thrilled and grateful to have these moments.”