Last year, Britney-devoted PopCrush readers crowned Britney Spears and Iggy Azalea's "Pretty Girls" as our official Song of Summer 2015. But which song will reign supreme in our Summer Song of 2016 poll?

In this latest Round 1 matchup, we ask you to choose between two tracks that are currently sitting side-by-side on in the Top 10 of the Billboard Hot 100: Will it be The Chainsmokers and Daya's "Don't Let Me Down," or Fifth Harmony's "Work From Home"?

"Don't Let Me Down" is a high energy EDM-pop bop with euphoric production, soaring vocals from Daya and lyrics full of emotional peaks and valleys. Since its February 2016 release, the viral track's spent 18 weeks on the Hot 100 chart — and its gained serious legs, hitting an all-time high of  No. 4. Danceable, sounds great blasting through your car speakers with the windows rolled down, and fun to sing along to? Sounds like a summer anthem to us.

Meanwhile, "Work From Home," Fifth Harmony's lead single from sophomore album 7/27, sits just below "Don't Let Me Down" at No. 5 on this week's Hot 100, after 16 weeks on the chart. The girl group has taken their Ty Dolla $ign-featuring single to many an awards show stage and talk show set, and it's gone double platinum in the U.S. The infectious hit only grows more ubiquitous by the day — did it already hit peak saturation status, or will its irresistibility endure through August? Weigh in with your prediction below.

Also facing off in Round 1....
Justin Timberlake's "Can't Stop the Feeling!" vs. Calvin Harris and Rihanna's "This Is What You Came For" - Vote now
Ariana Grande's "Into You" vs. Drake, WizKid + Kyla's "One Dance" - Vote now

This poll ends Wednesday, June 29 — be sure to vote before then!

PopCrush Debates: What's 2016's Song of the Summer? 

The Hot Dudes of EDM: Chainsmokers, Calvin Harris + More