For seven consecutive weeks this fall, female pop artists held down the top five spots on the Billboard Hot 100 singles chart. That was the first time such a feat was accomplished in the chart's 56-year history. (The reign ended on November 8 when Maroon 5's "Animals" edged out Iggy Azalea's "Black Widow.") Collectively, Iggy, Ariana Grande, Meghan Trainor, Jessie J and Tove Lo put together a collection of hits that not only dominated their male counterparts—but also the airwaves. —Jonathan Stern