"Alexander's Ragtime Band" is the name of a song by Irving Berlin. It was his first major hit, in 1911. There is some evidence, although inconclusive, that Berlin borrowed the melody from a draft composition submitted by Scott Joplin that had been submitted to a publisher.
"Alexander's Ragtime Band" is not itself an example of the ragtime musical idiom; apart from some mild syncopation, it has almost none of ragtime's characteristic features. Nonetheless, the lyrics clearly refer to the arrival of African-American musicians on the popular scene with their then-new idea of playing standard songs in a more exciting up-tempo style.
Vaudeville singer Emma Carus, famed for her "female baritone", is said to have been largely responsible for successfully introducing the song in Chicago and helping contribute to its immense popularity. It became identified with her, and soon worked its way back to New.
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