There's a new #1 this week at T40, as The Chainsmokers' massive single "Closer" f/ Halsey (Disruptor/Columbia) steamrolls into the top spot. Island /Republic's Shawn Mendes moves up inside the Top 5 to #3 with "Treat You Better." With clear momentum, Calvin Harris jumps up to #25 with "My Way" (Columbia) just one week after impact, along with Ariana Grande's "Side to Side"(Republic) which also joins the chart in its first week. And two artists that should hit the chart prior to their official impact dates at radio are superstars The Weeknd, with his freshly-released "Starboy" f/Daft Punk (XO/Republic) and RCA's Sia, with "The Greatest" f/Kendrick Lamar.