NFL fans were blown away by Grammy-winning acapella group Pentatonix as they performed the National Anthem minutes before the beginning of the Texans-Ravens game on Christmas Day.

The five-member group sang harmonies, combined with a vocal base, that astonished many NFL fans online.

Pentatonix formed in 2011 to compete on NBC competition show ‘The Sing-Off’, which it won.  The group has sold out arenas ever since.

They have also won three Grammy Awards and were honored with a star on the Hollywood Walk of Fame last year.

As the cameras panned to NFL stars listening to the National Anthem, such as Lamar Jackson and CJ Stroud, they looked amused by the vocals, as opposed to those at the 2018 NBA All-Star Game with Fergie’s rendition.

Here is a collection of what NFL fans on social media thought of the acapella legends.

NFL fans were blown away by Grammy-winning acapella group Pentatonix’s National Anthem

The five-member acapella group formed in the summer of 2011 and has won three Grammys

One NFL fan posted a GIF of a crowd giving a standing ovation.

‘They are awesome.’

‘SUPER FIRE!!!’

‘That was awesome. I just downloaded an album of their greatest hits onto my Spotify playlist.’

A collection of social-media messages marveling at the National Anthem sang by Pentatonix

Pentatonix’s main vocal trio are Scott Hoying, Mitch Grassi and Kirstin Maldonado, with beatboxer Kevin Olusola as the original members still with the group.

Matt Sallee, the band’s bass, joined officially in 2017.

Pentatonix were the first musical act to perform at NRG Stadium on Christmas Day, with Beyonce taking the field at halftime.