這項研究的核心結論是節奏上細微的差別。以Seeb在2015年發表、將Mike Posner的〈I Took A Pill In Ibiza〉歌曲重新混音的版本為例，二人在製作這首歌時發現，22% 到40% 之間的搖擺（Swing）程度，可以創造出最吸引人的節奏。這種技巧藉由稍微改變精準的格線拍子，為節奏帶來非常吸引人、但幾乎察覺不到的細微差別。
Duke University’s Center For The Public
Domain 分享了部分成為公共財的項目，清單如下：
詞曲使用
🎵Animal Crackers (musical starring
the Marx Brothers; book by George S. Kaufman and Morrie Ryskind and lyrics and
music by Bert Kalmar and Harry Ruby) 🎵Mack the Knife (original German
lyrics by Bertolt Brecht and music by Kurt Weill; from The Threepenny Opera) 🎵Let’s Do It (Let’s Fall in Love)
(Cole Porter; from the musical Paris) 🎵Sonny Boy (George Gard DeSylva,
Lew Brown & Ray Henderson; from the film The Singing Fool starring Al
Jolson) 🎵When You’re Smiling (lyrics by
Mark Fisher and Joe Goodwin and music by Larry Shay) 🎵Empty Bed Blues (J. C. Johnson) 🎵I Wanna Be Loved By You (lyrics
by Bert Kalmar and music by Herbert Stothart and Harry Ruby; from the musical
Good Boy) 🎵Makin’ Whoopee! (lyrics by Gus
Khan and music by Walter Donaldson) 🎵You’re My Necessity, You’re The
Cream in My Coffee (George Gard DeSylva, Lew Brown & Ray Henderson; from
the musical Hold Everything!) 🎵I Can’t Give You Anything But
Love, Baby (lyrics by Dorothy Fields and music by James Francis) 🎵Ramona (lyrics by L. Wolfe
Gilbert and music by Mabel Wayne) There’s a Rainbow ‘Round My Shoulder (Al
Jolson, Billy Rose, Dave Dreyer; from the film The Singing Fool) 🎵Beau Koo Jack (lyrics by Walter
Melros
錄製音樂
🎙️Charleston (recorded by James P. Johnson) 🎙️Yes! We Have No Bananas (recorded by Billy Jones; Furman and Nash; Eddie Cantor; Belle Baker; The Lanin Orchestra) 🎙️Who’s Sorry Now (recorded by Lewis James; The Happy Six; the Original Memphis Five) 🎙️Down Hearted Blues (recorded by Bessie Smith; Tennessee Ten) 🎙️Lawdy, Lawdy Blues (recorded by Ida Cox) 🎙️Southern Blues and Moonshine Blues (recorded by Ma Rainey) 🎙️Down South Blues (recorded by Hannah Sylvester; The Virginians) 🎙️Wolverine Blues (recorded by the Benson Orchestra of Chicago) 🎙️Tin Roof Blues (recorded by the New Orleans Rhythm Kings) 🎙️That American Boy of Mine and Parade of the Wooden Soldiers (recorded by Paul Whiteman and his Orchestra) 🎙️Dipper Mouth Blues and Froggie More (recorded by King Oliver’s Creole Jazz Band, featuring Louis Armstrong) 🎙️Bambalina (recorded by the Ray Miller Orchestra) 🎙️Swingin’ Down the Lane (recorded by the Isham Jones Orchestra; 🎙️The Shannon Four; The Columbians)
電影
🎬《汽船威利號》及《飛機迷》 Steamboat Willie and Plane Crazy (the silent version) (directed by Walt Disney and Ub Iwerks) 🎬《攝影師》 The Cameraman (directed by Edward Sedgwick and Buster Keaton) Lights of New York (directed by Bryan Foy; billed as “the first ‘all-talking’ picture”) 🎬The Circus (directed by Charlie Chaplin) 🎬The Passion of Joan of Arc (directed by Carl Theodor Dreyer) 🎬The Singing Fool (directed by Lloyd Bacon; follow-up to The Jazz Singer) 🎬Speedy (directed by Ted Wilde; Harold Lloyd’s last silent theatrical release) 🎬In Old Arizona (“100% all talking” film featuring singing cowboys) 🎬The Man Who Laughs (directed by Paul Leni; features a character who inspired the appearance of the Joker from Batman) 🎬Should Married Men Go Home? (directed by Leo McCarey and James Parrott; the first Laurel
and Hardy film to bill them as a team) 🎬The Wind (directed by Victor Sjöström) 🎬The Wedding March (directed by Erich von Stroheim) 🎬The Crowd (directed by King Vidor) 🎬The Last Command (directed by Josef von Sternberg; Emil Jannings won the first Academy Award for Best Actor) 🎬Street Angel (directed by Frank Borzage; Janet Gaynor won the first Academy Award for Best Actress)
