Chart preview tease

WE'RE HAVING A VISION: Don't fear the future, people—it's looking bright. Just ask Ariana Grande, whose "Problem" is about to hit #1 at Pop radio. Or Iggy Azalea and The Black Keys, who will extend their reign at Crossover and PoMo, respectively. We've got a detailed preview of next week's action on these key Mediabase charts right here. It's like having a time machine ... that only goes forward a couple of days and can only show you radio charts. (6/27p)