The Fates [Final Fantasy XII: The Zodiac Age] (Sextet)Hitoshi Sakimoto
The City that Never Sleeps [Final Fantasy IX] (Trio)Nobuo Uematsu
Sunset Waltz [Final Fantasy XV] (Trio)Yoko Shimomura
Silent Night with Night of Silence (Duet)Franz Xavier Gruber and Daniel Kantor
Saria's Song [The Legend of Zelda: Ocarina of Time] (Quintet)Koji Kondo
Remember Me [Disney Pixar Coco] (Duet)Robert Lopez and Kristen Anderson-Lopez
Proud Corazon [Disney Pixar Coco] (Quartet)Germaine Franco
Promise (Reprise) [Silent Hill] (Trio)Akira Yamaoka
Phantom and a Rose [Secret of Mana] (Septet)Hiroki Kikuta
Peaceful Days [Chrono Trigger] (Octet)Yasunori Mitsuda
Pa Paya [Final Fantasy XIV] (Nonet)Masayoshi Soken
One Horse Open Sleigh (Jingle Bells) (Duet)James Pierpont
My Favorite Things [The Sound of Music] (Quintet)Richard Rodgers
My Eyes [Dr. Horrible's Sing-Along Blog] (Sextet)Jed Whedon
Melodies of Life [Final Fantasy IX] (Trio)Nobuo Uematsu
Lion's Pride [World of Warcraft] (Decet)Jason Hayes
Kidnap the Sandy Claws [Disney Nightmare Before Christmas] (OcteDanny Elfman
Jingle Bell Rock (Duet)Joseph Carleton Beal and James Ross Boothe
It's Beginning to Look a Lot Like Christmas [Pentatonix] (SextetMeredith Willson
How Far I'll Go [Disney Moana] (Quartet)Lin-Manuel Miranda
Hedwig's Theme Variation [Harry Potter] (Trio)John Williams (more information in video description)
Happy Birthday (Quartet)Patty Hill and Mildred Hill
Greensleeves (Duet)Traditional English Folk
Frozen Heart [Disney Frozen] (Septet)Robert Lopez and Kristen Anderson-Lopez