Pentatonix could quite possibly be the most baller a cappella group out there - there, we said it.
If you've seen their viral YouTube channel with dozens of covers, you know you were thinking the same thing. And if you haven't...well, you're in luck, because they did a mashup of some of their best compilations with us!
To put the group to the test, we gave them the Ultimate Mashup Challenge - and they NAILED it, of course. Watch them sing Britney Spears' "Baby (One More Time)," Michael Jackson's "Thriller," Lorde's "Royals" and more - totally on the fly!