Heffron Drive can't be stopped! In their second round of Pop Clash, the band faced off against Cody Simpson. Heffron Drive's fanbase scored the band a whopping 73% of the vote! This week, the duo is up against Ariana Grande. Who should win the Pop Clash?

Heffron Drive's 'Parallel' is upbeat, anthemic and unforgettable! There's no denying that it's an insanely catchy track -- and one that Drivers can't seem to get enough of! We've had 'Parallel' on repeat and we predict it's going to be huge this summer.

Speaking of amazing summer jams, Ariana's Iggy Azalea collaboration, 'Problem,' is already taking over airwaves! The pint-size crooner's ode to a toxic relationship is all too relatable. We can't stop chanting "I got one less problem without ya"!

Which song should win this week's Pop Clash? You can vote for Heffron Drive or Ariana Grande once an hour until the polls close at 3PM ET on May 19.

Listen to Heffron Drive, 'Parallel'

Watch Ariana Grande, 'Problem' Feat. Iggy Azalea

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