By Jessica Goodman
Updated December 01, 2015 at 01:48 PM EST
Credit: Nicole Wilder/ABC

ABC celebrated its Charlie Brown Christmas special, It’s Your 50th Christmas, Charlie Brown, Monday night with host Kristen Bell, performances from Sarah McLachlan, Matthew Morrison, Boyz II Men, and Kristen Chenoweth, and appearances by Barack and Michelle Obama.

The special honored the Charlie Brown Christmas special’s 50th anniversary, but a major crowd pleaser came from America’s favorite a cappella group, Pentatonix. They performed Hark! “The Herald Angels Sing” with the All-American Boys Chorus. Set against a Peanuts backdrop, Pentatonix amped up the carol and gave it a modern spin even Charlie Brown would dig.