I think the fact that Sia and Imagine Dragons took the first 2 spots will help 45S surpass Bruno FASTER. The number 1 song on Itunes always enjoys bigger boost than the others, and Imagine Dragons dethroning Bruno for a few hours can be in advantage for 45S so y'all should not worry, because Sia and ID are bound to fall and by the time they do, 45S may be already above UF
