Duke Ellington was the most important composer in the history of jazz as well as being a bandleader who held his large group together continuously for almost 50 years. The two aspects of his career were related; Ellington used his band as a musical laboratory for his new compositions and shaped his writing specifically to showcase the talents of his bandmembers, many of whom remained with him for long periods. Ellington also wrote film scores and stage musicals, and several of his instrumental works were adapted into songs that became standards. In addition to touring year in and year out, he recorded extensively, resulting in a gigantic body of work that was still being assessed a quarter century after his death.

Ellington was the son of a White House butler, James Edward Ellington, and thus grew up in comfortable surroundings. He began piano lessons at age seven and was writing music by his teens. He dropped out of high school in his junior year in 1917 to pursue a career in music. At first, he booked and performed in bands in the Washington, D.C., area, but in September 1923 the Washingtonians, a five-piece group of which he was a member, moved permanently to New York, where they gained a residency in the Times Square venue The Hollywood Club (later The Kentucky Club). They made their first recordings in November 1924, and cut tunes for different record companies under a variety of pseudonyms, so that several current major labels, notably Sony, Universal, and BMG, now have extensive holdings of their work from the period in their archives, which are reissued periodically.