Who is performing at the Texans Christmas Day game halftime show?

Before Mrs. Carter takes the stage, Pentatonix, the a cappella group from Arlington, will perform the national anthem at the Texans vs. Baltimore Ravens game. Voices of Service, a group of veterans and active duty service members featured on "America's Got Talent," will perform the national anthem at the Chiefs vs. Steelers game. Mariah Carey will spread some holiday cheer with a prerecorded performance of "All I Want for Christmas Is You" that will air ahead of both games.