Pentatonix perform achingly beautiful a cappella cover of 'How Great Thou Art'

We all know Pentatonix has a way with cover songs - and their latest performance is no different!

With Christmas just days away, the quintet have belted out an achingly beautiful cover of 'How Great Thou Art' with American country music singer Mickey Guyton.

Putting their signature spin on the iconic hymn, the five singers - Scott Hoying, Mitch Grassi, Kirstin Maldonado, Kevin Olusola and Matt Sallee - and Guyton allowed their flawless harmonies to shine.

The festive performance was part of the Sounds of the Season: Together Again Christmas special, with the artists performing holiday classics with their own unique take.