Listen to The Most Wonderful Day of the Year (From "A Very Glee Christmas") online. The Most Wonderful Day of the Year (From "A Very Glee Christmas") is an English language song and is sung by Mistletoe Singers. The Most Wonderful Day of the Year (From "A Very Glee Christmas"), from the album Glee Inspired Christmas Soundtrack, was released in the year 2016. The duration of the song is 3:25. Download English songs online from JioSaavn.