Nearly every pop music holiday song written in the past 80 years owes at least some of its DNA to one Christmas tune in particular: "White Christmas," written by Irving Berlin and sung by Bing Crosby, which he first recorded in 1942.

It's reportedly still one of the best-selling songs of all time in any genre, though chart data from decades ago is unreliable. Even given that murkiness, the Guinness Book of World Records named it as the best-selling physical single of all time in 2012.

"White Christmas" wrote the formula for modern secular holiday songs — despite its complex and troubling history.

Songwriter Irving Berlin wasn't destined to be a Yuletide magic maker. He was born Israel Baline in Siberia to an Orthodox Jewish family; his father was a cantor turned kosher butcher. But Berlin embraced assimilation — he married an Irish Catholic woman and had Christmas trees in his house. Even so, for Berlin, Christmas was a holiday shadowed by personal tragedy.

"On Christmas Day, 1928, his only son died. He always told members of his family that he disliked Christmas for this reason, that he could never, never get past the sadness that he experienced on Christmas Day," said author and New York Times contributing writer Jody Rosen, who wrote a book called White Christmas: The Story of an American Song.

The infant Irving Berlin Jr. died suddenly, less than a month after he was born. And at its heart, "White Christmas" is a deeply melancholic song. Most Christmas carols and pop songs were unabashedly joyful. Berlin's song represented a turn, Rosen said: "It was strange to have a song that was all about this nose-pressed-up-to-the-glass feeling."

It also set a certain standard for Christmas songs that are about nostalgia, about some lost Christmas past. (Think, for example, of another enduring hit that came shortly after Berlin's smash: "Have Yourself A Merry Little Christmas," which Judy Garland sang in the 1944 film Meet Me in St. Louis, and which was written by Hugh Martin and Ralph Blane.)

But there's other stuff going on, too. Irving Berlin was a hit machine as a Tin Pan Alley and Broadway songwriter. As a New Yorker and an immigrant himself, he was intimately familiar with a particular genre of songs, Rosen said: "That tradition of so-called 'home songs,' you know, songs that pine for a lost place, a lost ideal. These songs are so huge because we have an immigrant population, lots of people who've done a lot of moving. So there were songs about Irish people longing for Ireland and Italians longing for the old country there."

He said Berlin took that genre and flipped it into a Christmas song.That's especially true of a largely forgotten, tongue-in-cheek introductory verse Berlin originally wrote for "White Christmas." The narrator is a New Yorker stuck in California (as Berlin frequently was, churning out songs for Hollywood.) "The sun is shining, the grass is green, the orange and palm trees sway…but it's December the 24th, and I am longing to be up north!" the protagonist sings.

Rosen said most people listening to "White Christmas" are missing additional subtext. He said that much of that nostalgia vibe in "White Christmas" — all that longing for a pristine, innocent Christmas of yore — is a reference to explicitly racist minstrel songs like Stephen Foster's "Old Kentucky Home," sung by Al Jolson and others — music that was still a staple in Berlin's day.

Foster was inspired by the Harriet Beecher Stowe novel Uncle Tom's Cabin and the song, hailed by Frederick Douglass and Paul Robeson, was meant to be empathetic to the abolitionist cause — the narrator is longing to be reunited with his wife and children, but their family has been torn apart by slaveholders. It later became a popular tune at minstrel shows, with its saddest lines omitted and its meaning twisted.

In "Old Kentucky Home," Rosen said, "You have, grotesquely, the freed Black man longing for life back below the Mason-Dixon line, back on the plantation. Here, instead of a Black man in the north longing for the sultry south, we have a well-to-do white person longing for the wintry north."

But the racial dynamics of "White Christmas" aren't just a matter of subtle references to older songs. Irving Berlin had great commercial expectations for "White Christmas." He built a whole movie around it: 1942's Holiday Inn, starring Bing Crosby and Fred Astaire.

Holiday Inn is stuffed with racist stereotypes and an entire blackface number. (That scene is usually excised from TV broadcasts today, but the whole film is available to stream online.) As Crosby and his love interest, played by Marjorie Reynolds, prepare to perform a song about Abraham Lincoln, Crosby spreads greasepaint on her face, as the orchestra plays "White Christmas" underneath. Not only is "White Christmas" the movie's biggest hit, it's also the film's romantic theme.

Blackface on stage and on screen was very much a recent memory for 1940s audiences, said scholar Brynn Shiovitz. She's the author of the book Behind the Screen: Tap Dance, Race, and Invisibility During Hollywood's Golden Age.

In Holiday Inn, Shiovitz said, "We get a pairing of nostalgia for Christmas, but also nostalgia for blackface, because so many of the people that were watching Holiday Inn when it premiered in the theaters grew up watching vaudeville, grew up watching their parents maybe even perform in blackface."

Audiences loved the song "White Christmas" and its spotlight in Holiday Inn — and American GIs stationed abroad during World War II clamored for the Armed Forces Radio Service to play the song. "White Christmas" was so sturdily successful that Hollywood made another movie centering the song in 1954 — also called White Christmas — this time starring Bing Crosby, Danny Kaye, Rosemary Clooney and Vera-Ellen.

Since then, legions of musicians have recorded their own versions of "White Christmas" — from The Drifters and Elvis Presley to Iggy Pop and Sabrina Carpenter. And of course, each generation adds new layers of meaning to the song as it is stitched into our holiday season each year, said Shiovitz.

"With all of these other memories that people have of Christmas, whether it's being piped in while you're shopping, or it's playing on the radio in the car as you're driving to visit family — it's easy to kind of separate it from its history. People develop new memories with it. People have their own ideas of what the song represents, so it's just incredibly complex," Shiovitz said.

Today's audiences and artists don't necessarily hear or even know about the song's racist history, Shiovitz said — but that doesn't mean it's not there.

This story was edited for radio and digital by Jennifer Vanasco.

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