Pentatonix has done it again. They just keep getting more and more amazing with each video they do. This time they have covered the Ariana Grande hit 'Problem'.In the original song from Grande, Iggy Azalea has a guest appearance rap in the middle of the song. Pentatonix didn't disappoint, they nailed it! Give the song a listen here.

Pentatonix Covers Ariana Grande 'Problem'