As you've probably surmised,the big story on the Top 40 chart this week is the immediate airplay that the three tracks with 100+ adds are posting this week. Taylor Swift's "Wildest Dreams" (Big Machine/Republic) broke all add-day records; BMBG/Def Jam's Justin Bieber should have the Greatest Gainer this week with "What Do You Mean?"; and these two, along with "Downtown" from Macklemore/Warner Bros.' Macklemore & Ryan Lewis, should land in the Top 25 when all is said and done. Other big movers include The Weeknd's "The Hills" (XO/Republic), which moves Top 15, and RCA's R. City f/Adam Levine with "Locked Away," which is moving up inside the Top 10.