“Outside” also ascends a spot to No. 1 on Rap Airplay, becoming the rapper’s eighth ruler.

For no other reason than it’s a cool idea, Billboard and Polygraph collaborated on an interactive timeline of every #1 rap song from 1989-2015. It’s an informative time-waster, and a fun way ...

"Justin randomly texted me this song one day and said, 'Should we do a visual to this? Song straight to number 1,'" Bennett said. "We joked around about doing a video for it but never did.

And Levy took to his Twitter to celebrate: "We got a #1 Rap Billboard! Thank you to everyone who helped make this happen by getting the song on iTunes! Glory to God for giving us a voice!" ...

The Billboard Hot 100 singles chart tracks the most popular songs every week from Friday to Thursday based on a combination of their sales, online streams (audio and video), and radio airplay ...