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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.