<P> Maldonado, Hoying, and Grassi appeared as members of a cappella groups in the Fox television show Bones, in the episode "The Strike In the Chord" that originally aired on May 19, 2016 . </P> <P> They made a guest appearance on The Voice on November 24, 2016 where they sang their rendition of "Jolene" alongside Miley Cyrus and the song's writer and original performer, Dolly Parton . </P> <P> On December 14, 2016, the group hosted their first Christmas special, titled around their current album, A Pentatonix Christmas Special . The hour - long special aired on NBC and featured guest appearances by Reba McEntire, Dolly Parton, and Kelly Clarkson . </P> <P> Pentatonix had a cameo role in Pitch Perfect 2, released in May 2015, as the Canadian team competing against the Barden Bellas . Pentatonix also released a documentary about the group's journey titled "On My Way Home" (based off the original song of the same name from PTX, Vol . III and the group's 2015 tour) on June 18, 2015, which was promoted on social media through the hashtag #OnMyWayHomeProject . </P>

Who sang with pentatonix on their christmas special
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