To say that Pentatonix are keeping their pitch-perfect ears to the ground on what's hot this summer would be a huge understatement. They've already contributed a song to the Teenage Mutant Ninja Turtles soundtrack, and now they've taken on the season's biggest smash, Ariana Grande and Iggy Azalea's "Problem!"

The fact that Pentatonix can recreate nearly every last horn blast and pop riff from Grande's hit using only their voices is totally insane, as they've nailed each detail of the one song everyone's had stuck in their heads for months now. It's no simple feat, and even Iggy's verse pops on this a cappella take.

Listen to the Song of the Day now, and stay tuned for more twists on "Problem" in the next couple of weeks: both Ari and Iggy will be performing at the MTV VMAs on August 24, and we'd be shocked if their hit didn't get the main stage treatment for at least a bar or two.