Radio preview tease

WE HAVE SEEN THE FUTURE: Driverless cars! Packages delivered by drone! Las Vegas under water! These things all await us in the world of tomorrow, but we're actually focusing on the more immediate future. By which we mean next week's action at Top 40, Rhythmic and Alternative radio. You'll see Def Jam's Iggy Azalea hit the Top 10 at Pop, while Republic's Ariana Grande, who features Iggy as a guest, is the format's Greatest Gainer; Capitol's Sam Smith also makes serious strides. Nonesuch/Warner Bros.' The Black Keys hold on to #1 at PoMo, while RCA's Bleachers head for the Top 5 and Island via Republic's Tove Lo makes a nice jump. For more Nostradamus-like predictions, go here. (5/16p)