There's another new #1 this week at T40, as The Chainsmokers finally get into the top spot with "Don't Let Me Down" f/Daya (Disruptor/Columbia), while label mate Calvin Harris joins the Top 5 with "This Is What You Came For" f/Rihanna and Ariana Grande's "Dangerous Woman" (Republic) inches up inside the Top 5. Sia's "Cheap Thrills" (RCA) is this week's Greatest Gainer, taking a big jump up inside the Top 10 to #7. Walt Disney/RCA's Pink moves up to #12 with "Just Like Fire."  Kent Jones' "Don't Mind" (WeTheBest/Epic) leaps into the Top 15. Shawn Mendes' "Treat You Better" (Island/Republic) is joining the Top 20. And finally, look for Drake's "Too Good" f/Rihanna (YMCMB/Republic) to chart this week.