Count Basie August 19, 1950
Label Name:Giants of Jazz
Venue Location:Hollywood, Los Angeles, CA
This, according to Varela, was part of a short film that highlighted both Basie and the child prodigy Sugar Chile' Robinson. However, it doesn't appear that Robinson played in this particular filmed sesion with Holiday and Basie.
Alberto Varela's Billie Holiday discography (http://varelasite.com.ar/billieholiday.htm); Tom Lord (lordisco.com)