“It’s the Most Wonderful Time of the Year,” sung by Idina Menzel. Do I need to explain who Menzel is? It’s from her 2019 Christmas: A Season of Love album.
The song was written specifically for The Andy Williams Show’s Christmas episode in 1963 by its vocal director George Wyle and co-composer Edward Pyle. That same year Williams recorded it for his first holiday album, the eponymous The Andy Williams Christmas Album