Aligning nicely with the RCA Staff gathering in NYC this week, Sia's "Cheap Thrills" officially takes over the #1 slot at Pop. Calvin Harris f/Rihanna's "This Is What You Came For" (Columbia) moves swiftly to #3. Island/Republic's Shawn Mendes joins the Top 10 with "Treat You Better" and Ariana Grande's "Into You" (Republic) moves up to #18, just as Rihanna's "Needed Me" (WestburyRoad/Roc Nation) joins the Top 20. Charting this week will be the two superstar ladies that dropped songs on the same day, Britney Spears f/G-Eazy's single "Make Me" on RCA which launches into the Top 25 and Katy Perry's Summer Olympics theme song "Rise" (Capitol), debuting inside the Top 35. Plus, watch out for Mad Decent/Def Jam's Major Lazer f/Justin Bieber and MØ to storm the chart with their new effort, "Cold Water." And finally, Casablanca/Republic's worldwide viral hit from Kungs & Cookin On 3Burners called "This Girl," should have a great debut as well.