A capella trio's emotional Christmas medley goes viral

If you love powerful a capella arrangements of Christmas songs, this video will make your day.

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The members of Christian a capella trio RESOUND are astonished at the popularity of the video, which has more than a million views on Facebook. Mariah Hargrove, Joseph Clarke and Jessica Fox (from left to right in the video) form the group, which is based out of Richmond, Va.

"We are literally speechless and cannot believe this video has reached so many people!" the group said in an email to ABC.

Posted by the a capella trio in December 2013, the video recently shot to popularity after being posted on Facebook by someone who doesn't know the trio. That link was tweeted out by pop singer Ariana Grande, who sang praises of the group.