Gallagher & Shean was a highly successful musical comedy double act on vaudeville and Broadway in the 1910s and 1920s, consisting of Edward Gallagher (1873 – March 28, 1929) and Al Shean (real name "Abraham Elieser Adolph Schönberg") (May 12, 1868 – August 12, 1949); Shean was an uncle of the Marx Brothers.
Both comedians were relatively obscure vaudeville performers before they teamed up. Gallagher and Shean first joined forces during the tour of The Rose Maid in 1912, but they quarreled and split up two years later. They next appeared together in 1920, through the efforts of Shean's sister, Minnie Marx (mother of the Marx Brothers). This pairing lasted until 1925 and led to their fame.
Gallagher and Shean remain best known for their theme song "Mister Gallagher and Mister Shean", which was a hit in the 1922 Ziegfeld Follies. Bryan Foy, son of stage star Eddie Foy and eldest member of the "Seven Little Foys", claimed to have written the song, but it is officially attributed to Gallagher and Shean. The song endured in popularity and was regularly tweaked and updated with additional verses; consequently, it exists in several different versions. The song was recorded by Gallagher and Shean as two sides of a 10" 78rpm record in 1922 for Victor Records. It was also recorded on Okeh Records by The Happiness Boys (Billy Jones and Ernie Hare) and on Cameo Records by Irving and Jack Kaufman. When performed by other artists, it was usually preceded with this introductory lyric: