The Real Group performed a beautifully layered vocal cover of "Blackbird", one of the most iconic songs by The Beatles.
Korean A cappella group MayTree performed an incredibly lyrical cover of the resurgent Kate Bush song "Running Up That Hill (Deal With God)".
MayTree performed a resounding cover of the theme from Back to the Future with sound effects and all.
MayTree performed a buoyant A Cappella cover of the iconic instrumental theme for the British children's television show Thomas & Friends.
MayTree performed a rather badass a cappella cover of the newly resurgent Metallica song "Master of Puppets".
Anne Reburn performed a harmonious cover of the Flight of the Conchords song "Friends", accompanying herself in different iterations.
Michael McDonald and Take Six performed an incredible A Cappella cover of the Beach Boys' song "Don't Worry Baby", while backstage.
Geoff Castellucci performed a low bass, a cappella cover of "Rains of Castamere" from Game of Thrones while sitting on an Iron Throne.
MayTree performed a jazzy a cappella cover of the "Pink Panther Theme" from the classic cartoon series of the same name.
MayTree performed a historical A cappella medley capturing the evolution of Microsoft Windows startup sounds throughout the years.