It's true: Iggy remains atop the charts, with both the No. 1 ("Fancy," featuring Charli XCX) and the No. 2 ("Problem," alongside Ariana Grande) songs. Meanwhile, Charli's doing her own solo chart-climbing, with "Boom Clap" (off The Fault in Our Stars soundtrack) rising from No. 62 to 29. You might stop hearing John Legend's "All of Me" on the radio — it slipped a bit — but keep an eye out for "Rude" by MAGIC! or Nico & Vinz's "Am I Wrong." They could maybe lead a Song of Summer sneak-attack? It's Iggy's to lose, though.