Ariana Grande scores her first number one hit at Top 40 radio; Echosmith makes its first appearance IN the Top 40.

It is official: Ariana Grande’s “Problem” is pop radio’s most-played track.

The blockbuster song, which features a rap verse from Iggy Azalea, has officially edged Azalea’s own “Fancy (featuring Charli XCX)” to become the #1 song on Mediabase’s rolling airplay chart.

Spun 16,792 times over the seven day period ending June 26, “Problem” garnered 115.07 million audience impressions via the pop format.

Still one of pop radio’s biggest gainers, its weekly spin count exceeds that of the previous week by 1,192.

“Fancy,” which is losing steam at radio, received 16,686 spins over the measured period. It earned 112.11 million impressions.

Other stories on the Mediabase rolling Top 40 airplay chart dated 6/27:

— Sam Smith’s “Stay With Me” rises to a new peak of #10.

— Blocked from entering the Top 20 this past week by Maroon 5’s rising “Maps,” Demi Lovato’s “Really Don’t Care (featuring Cher Lloyd)” will overtake KONGOS’ “Come With Me Now” to reach the Top 20 this weekend.

Echosmith Cool Kids

“Cool Kids” Goes Top 40

— Shakira’s rapidly declining “Empire” officially slips out of the Top 40. Now occupying the slot is Echosmith’s “Cool Kids,” which rises to #40 on the strength of 920 pop radio spins.

Hot on its heels (and rising faster), Florida Georgia Line’s #41 “This is How We Roll (remix featuring Jason DeRulo)” will likely leapfrog “Cool Kids” this weekend.

But as Neon Trees’ declining “Sleeping with a Friend,” HAIM’s declining “Forever” and 5 Seconds of Summer’s declining “She Looks So Perfect” all begin to slip out of the Top 40, the Echosmith tune will receive a quick opportunity to bounce back into that illustrious portion of the chart.

— The top 5 airplay gainers at pop radio: Maroon 5’s “Maps” (+2627 spins this week), Nico and Vinz’ “Am I Wrong” (+2085), MAGIC!’s “Rude” (+1824), Sam Smith’s “Stay With Me” (+1379) and Ariana Grande’s “Problem (featuring Iggy Azalea)” (+1192).

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