From Oxford professor and renowned British composer, a joyous account of the history behind our favorite carols.

Everyone loves a carol--in the end, even Ebenezer Scrooge. They have the power to summon up a special kind of mid-winter mood, like the aroma of gingerbread or the twinkle of lights on a tree. It's a kind of magic.

But how did they get that magic? Andrew Gant--choirmaster, church musician, university professor, and writer--tells the story of some twenty carols, each accompanied by lyrics and music, unraveling a captivating, and often surprising,...