That's Harry James tuning up the fiddle, along with members of his 1943 orchestra. Upon enlargement, I could make out the string charts on the stand: Dancing in the Dark (left) and I Remember You. Clockwise from the upper left-hand corner is saxophonist Sam Marowitz, first violinist Sam Caplan, James and vocalist Helen Forrest, probably in Hollywood.
This image comes from Betty's collection of stills and snapshots, sent along by her friend Chris. Betty has donated all of her prints, including this one, to Rutgers University's Institute of Jazz Studies. But since she and Chris also are big JazzWax fans, they wanted you to see them, too.
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JazzWax clip: Here's Harry James in 1943 with Helen Forrest on Mister Five by Five...