Erskine Hawkins Orchestra 1938 “Unknown title“

Superb footage of the Erskine Hawkins band with an unknown title. Can anyone identify it? “Yvesfrancois“ points out that the title of this number is “Swinging In Harlem“. To my great delight Paul Bascomb jr. informed me that it is his father on sax and his uncle Dud “Wilbur“ Bascomb on trumpet.