Welcome to Billboard's weekly video show "Real-Time Rewind," which recaps the past week's hottest action on the new Billboard Real-Time Twitter Charts -- Trending 140 and Emerging Artists -- and the news that's driving the action. Hosted by Billboard's Joe Levy, you can watch episode 9, which features Jessie J and Troye Sivan.

VIEW THE REAL-TIME CHARTS: TRENDING 140 | EMERGING ARTISTS

So what was happening on the Real-Time Charts this week?

Jessie J's collaboration with Ariana Grande and Nicki Minaj, "Bang Bang," shot to the top of the Trending 140 the moment it was released on July 29.

Troye Sivan's "Happy Little Pill" reached the No. 1 slot on the Trending 140 as soon as it was available on Friday, July 25. The 19-year-old's TRXYE single was also the sixth most talked about on Twitter last week.

The Trending 140 chart measures the acceleration of conversation around artists and their music, while the Emerging Artists chart measures the volume of tweets around new artists and their songs.

Watch Previous "Real-Time Rewind" Episodes:
1. Drake, Kimbra | 2. Psy & Snoop | 3. Lana Del Rey, Maroon 5
4. Robin Thicke, Sam Smith | 5. Busta Rhymes  & Eminem | 6. Ariana Grande, Alt-J & 5 Seconds of Summer 7. Britney Spears, PARTYNEXTDOOR & Naughty Boy | 8. "Weird Al" Yankovic