By Count Basie & his Sextet. Filmed by Universal-International and released in 1951 as "Sugar Chile' Robinson, Billie Holiday, Count Basie and His Sextet".
That, friends, is the legendary Wardell Gray on the tenor saxophone taking 2 nice choruses of the blues. Savor it. This film is the only surviving footage of Gray performing live. I have seen a few precious seconds of a home movie in which you can see Gray for a few frames, but this is pretty much it. For further interesting reading on Wardell, check out this blog entry from a while back.