Question: What year did a popular song release that was accompanied by dancing by a famous American dancer?

full_context: Document 1: Ziegfeld Follies (film): Ziegfeld Follies is a 1946 American musical comedy film released by Metro-Goldwyn-Mayer and directed by Lemuel Ayers, Roy Del Ruth, Robert Lewis, Vincente Minnelli, Merrill Pye, George Sidney and Charles Walters. It stars many of MGM leading talents, including Fred Astaire, Lucille Ball, Lucille Bremer, Fanny Brice (the only member of the ensemble who was a star of the original Follies), Judy Garland, Kathryn Grayson, Lena Horne, Gene Kelly, James Melton, Victor Moore, William Powell, Red Skelton, and Esther Williams.
Document 2: DuBarry Was a Lady: Du Barry Was a Lady is a Broadway musical, with music and lyrics by Cole Porter, and the book by Herbert Fields and B.G. DeSylva. The musical starred Bert Lahr, Ethel Merman and Betty Grable, and the song "Friendship" was one of the highlights. The musical was made into a 1943 Technicolor film, "Du Barry Was a Lady", starring Red Skelton, Lucille Ball, and Gene Kelly.
Document 3: Deep in My Heart (1954 film): Deep in My Heart is a 1954 MGM biographical musical film about the life of operetta composer Sigmund Romberg, who wrote the music for "The Student Prince", "The Desert Song", and "The New Moon", among others. Leonard Spigelgass adapted the film from Elliott Arnold's 1949 biography of the same name. Roger Edens produced, Stanley Donen directed and Eugene Loring choreographed. José Ferrer played Romberg, with support from soprano Helen Traubel as a fictional character and Merle Oberon as lyricist Dorothy Donnelly.
Document 4: This Heart of Mine: "This Heart of Mine" is a 1946 song. This music standard was written by composer Harry Warren and lyricist Arthur Freed to be featured in the musical film score "Ziegfeld Follies". This song is introduced by Fred Astaire who danced with Lucille Bremer in a lavish and romantic dance. In the same film, Esther Williams swam in a water ballet to a softer, instrumental version of the song. Judy Garland and Maxine Sullivan have also recorded this song.
Document 5: Cyd Charisse: Cyd Charisse (born Tula Ellice Finklea; March 8, 1922 – June 17, 2008) was an American dancer and actress.
Document 6: Lucille Ball: Lucille Désirée Ball (August 6, 1911 – April 26, 1989) was an American actress, comedienne, model, film-studio executive, and producer. She was best known as the star of the self-produced sitcoms "I Love Lucy", "The Lucy–Desi Comedy Hour", "The Lucy Show", "Here's Lucy", and "Life with Lucy".
Document 7: Joan Crawford: Joan Crawford (born Lucille Fay LeSueur; (March 23, 190? – May 10, 1977) was an American film and television actress who began her career as a dancer and stage showgirl. In 1999, the American Film Institute ranked Crawford tenth on its list of the greatest female stars of Classic Hollywood Cinema.
Document 8: Lucille Bremer: Lucille Bremer (February 21, 1917 – April 16, 1996) was an American film actress and dancer.
Document 9: Louise Brooks: Mary Louise Brooks (November 14, 1906 – August 8, 1985), who worked professionally as Louise Brooks, was an American film actress and dancer noted as an iconic symbol of the flapper, and for popularizing the bobbed haircut.
Document 10: That's Entertainment! (song): "That's Entertainment!" is a popular song with music written by Arthur Schwartz and lyrics by Howard Dietz. The song was published in 1952 and was written especially for the 1953 Metro-Goldwyn-Mayer musical film "The Band Wagon". The song is performed in the film by Jack Buchanan supported by Fred Astaire, Nanette Fabray, and Oscar Levant. In 2004 the song finished at #45 in AFI's 100 Years...100 Songs survey of top tunes in American cinema.
Document 11: Vera-Ellen: Vera-Ellen (born Vera-Ellen Westmeier Rohe; February 16, 1921 – August 30, 1981) was an American dancer and actress, principally
Document 12: Audrey Hepburn: Audrey Hepburn ( ; born Audrey Kathleen Ruston; May 4, 1929January 20, 1993) was a British actress, model, dancer and humanitarian. Recognized as a film and fashion icon, Hepburn was active during Hollywood's Golden Age. She was ranked by the American Film Institute as the third-greatest female screen legend in Golden Age Hollywood and was inducted into the International Best Dressed List Hall of Fame.
Document 13: Harry Warren: Harry Warren (born Salvatore Antonio Guaragna, December 24, 1893 – September 22, 1981) was an American composer and lyricist. Warren was the first major American songwriter to write primarily for film. He was nominated for the Academy Award for Best Song eleven times and won three Oscars for composing "Lullaby of Broadway", "You'll Never Know" and "On the Atchison, Topeka and the Santa Fe". He wrote the music for the first blockbuster film musical, "42nd Street", choreographed by Busby Berkeley, with whom he would collaborate on many musical films.
Document 14: I've Got My Eyes on You (1939 song): "I've Got My Eyes on You" is a popular song by Cole Porter, published in 1939 and written for the Hollywood musical film "Broadway Melody of 1940" where it was introduced by Fred Astaire. Later that year, it was included in "Andy Hardy's Private Secretary" (1940) where it was sung by Kathryn Grayson. The song is also played as background music by a band in the 1956 musical "High Society", starring Frank Sinatra, Bing Crosby and Grace Kelly and in the 1940 comedy "The Philadelphia Story", starring Katharine Hepburn and Cary Grant.
Document 15: I'm Old Fashioned (ballet): I'm Old Fashioned (The Astaire Variations) is a ballet made by New York City Ballet balletmaster Jerome Robbins to Morton Gould's adaptation of a theme by Jerome Kern, “I'm Old Fashioned,” to a Fred Astaire and Rita Hayworth sequence from the film "You Were Never Lovelier". The premiere took place on Thursday, June 16, 1983, at New York State Theater, Lincoln Center. It was titled "Variations on "I'm Old Fashioned"" at its first performance, but the name was truncated to its current form the following week.
ground_truth: 1946