"The Christmas Song" (commonly subtitled "Chestnuts Roasting on an Open Fire" or, as it was originally subtitled, "Merry Christmas to You") is a classic Christmas song written in 1945 by Robert Wells and Mel Tormé.

According to Tormé, the song was written in July during a blistering hot summer. In an effort to "stay cool by thinking cool", the most-performed (according to BMI) Christmas song was born ] "I saw a spiral pad on his (Wells's) piano with four lines written in pencil", Tormé recalled. "They started, 'Chestnuts roasting..., Jack Frost nipping..., Yuletide carols..., Folks dressed up like Eskimos.' Bob didn't think he was writing a song lyric. He said he thought if he could immerse himself in winter he could cool off. Forty minutes later that song was written. I wrote all the music and some of the lyrics."

The Nat King Cole Trio first recorded the song in June 1946. At Cole's behest – and over the objections of his label, Capitol Records – a second recording was made in August utilizing a small string section, this version becoming a massive hit on both the pop and R&B charts. Cole again recorded the song in 1953, using the same arrangement with a full orchestra arranged and conducted by Nelson Riddle, and once more in 1961, in a stereophonic version with another full orchestra arranged and conducted by Ralph Carmichael. Cole's 1961 version is generally regarded as definitive, and in 2004 was the most-loved seasonal song with women aged 30–49 while the original 1946 recording was inducted into the Grammy Hall of Fame in 1974

Nat King Cole recordings

First recording: Recorded at WMCA Radio Studios, New York City, June 14, 1946. Label credit: The King Cole Trio (Nat King Cole, vocals & piano; Oscar Moore, guitarist; Johnny Miller, bassist). Not issued until 1989, when it was (accidentally) included on the various-artists compilation Billboard Greatest Christmas Hits (1935–1954) Rhino R1 70637(LP) / R2 70637(CD).

Second recording: Recorded at WMCA Radio Studios, New York City, August 19, 1946. First record issue. Label credit: The King Cole Trio with String Choir (Nat King Cole, vocals & piano; Oscar Moore, guitarist; Johnny Miller, bassist; Jack "The Bear" Parker, drummer; Charlie Grean, arranger and conductor of 4 string players and a harpist).[9][10] Lacquer disc master #981. Issued November 1946 as Capitol 311 (78rpm). It is available on the Cole compilation CDs Capitol Collectors Series and Christmas for Kids: From One to Ninety-Two, as well as on a CD called The Holiday Album, which has 1940s Christmas songs recorded by Cole and Bing Crosby.

Third recording: Recorded at Capitol Studios, Hollywood, August 24, 1953. It was the song's first magnetic tape recording. Label credit: The King Cole Trio with String Choir (Nat King Cole, vocals; Buddy Cole, pianist; John Collins, guitarist; Charlie Harris, bassist; Lee Young, drummer; Charlie Grean, Pete Rugolo and Nelson Riddle, orchestral arrangement; Nelson Riddle, orchestra conductor).[10][11] Master #11726, take 11. Issued November 1953 as the "new" Capitol 90036(78rpm) / F90036(45rpm) (Capitol first issued 90036 in 1950 with the second recording). Correct label credit issued on October 18, 1954 as Capitol 2955(78rpm) / F2955(45rpm). Label credit: Nat "King" Cole with Orchestra Conducted by Nelson Riddle. This recording is available on the Cole compilation CD Cole, Christmas, & Kids, as well as on the various-artists CDs Ultimate Christmas and Casey Kasem Presents All Time Christmas Favorites. It was also included, along with both 1946 recordings, on the Mosaic Records box set The Complete Capitol Recordings of the Nat King Cole Trio.
Nat King Cole recordings

Fourth recording: Recorded at Capitol Studios, New York City, March 30, 1961. This rendition, the first recorded in stereo, is widely played on radio stations during the Christmas season, and has become the most popular/familiar version of this songLabel credit: Nat King Cole (Nat King Cole, vocals; Hank Jones, pianist; John Collins, guitarist; Charlie Harris, bassist; Lee Young, drummer; Charlie Grean, Pete Rugolo and Ralph Carmichael, orchestral arrangement; Ralph Carmichael, orchestra conductor).The instrumental arrangement is nearly identical to the 1953 version,[10] but Cole's vocals are deeper-sounding and more focused. Originally done for The Nat King Cole Story (a 1961 LP devoted to stereo re-recordings of Cole's earlier hits), this recording was later included in a reissue of Cole's 1960 holiday album The Magic of Christmas replacing "God Rest Ye Merry Gentlemen". Retitled The Christmas Song, the album was issued in 1963 as Capitol W-1967(mono) / SW-1967(stereo) and today is in print on compact disc. This recording of "The Christmas Song" is also available on numerous compilation albums. Some are Capitol pop standards Christmas compilations while others are broader-based. For example, it is available on WCBS-FM's Ultimate Christmas Album Volume 3. An alternate take of the 1961 recording, featuring a different vocal and missing the solo piano on the instrumental bridge, appears on the Deluxe Edition of the 2014 compilation The Extraordinary Nat King Cole.

There were several covers of Nat Cole's original record in the 1940s. The first of these was said to be by Dick Haymes on the Decca label, but his was released first – not recorded first. The first cover of "The Christmas Song" was performed by pop tenor and bandleader Eddy Howard on Majestic. Howard was a big Cole fan, and also covered Nat's versions of "I Want to Thank Your Folks" and "(I Love You) For Sentimental Reasons", among others.