It’s 1937. Famous jazz impresario John Hammond has signed on as the Count Basie Orchestra’s promoter, and brings the band to New York for a pivotal engagement at the Roseland Ballroom. The Basie band soon rises to national attention during the heyday of swing dancing, and began making its first recordings for Decca records in the same year, including the instant hit, “One O’Clock Jump.” The band included such heralded stars as tenor saxophonists Lester Young and Herschel Evans, trumpeters…