Bruno Mars and Lady Gaga have been ruling pop radio independently for nearly 15 years, and last week they finally came together for their first collaboration: the bombastic pop/rock duet “Die With a Smile.”

In the new Billboard Pop Shop Podcast, Katie & Keith talk about what makes them such a powerful pop duo. And we also talk about F-1 trillionPost Malone’s first country album and why it fits the genre so well.

Also on the show we have chart news about how Taylor Swift meets Carole King in the chart history books as The Tormented Poets Department spends a 15th week at No. 1 on the Billboard 200, as Chappell Roan’s The Rise and Fall of a Midwest Princess climbs to No. 2 on the Billboard 200 for the first time, and Billie Eilish’s “Birds of a Feather” enters the top five on the Billboard Hot 100.

The Billboard Pop shop Podcast is your one-stop-shop for all things pop on Billboard’s weekly charts. You can always count on lively discussion of the latest pop news, fun chart stats and stories, new music, and guest interviews with music stars and people from the pop world. Casual pop fans and chart junkies can catch Billboard’s executive digital director, West Coast, Katie Atkinson, and Billboard’s managing director, charts and data operations, Keith Caulfield, each week on the podcast, which can be streamed on Billboard.com or downloaded in Apple Podcasts or your favorite podcast provider.Click here to listen to the previous edition (from the show on Billboard.com.)