Soundies 1940s - Will Bradley Orchestra, Billie Joyce and Roberta Hollywood (vocals) 

I was too young in the 40's for this but my Uncle took me to see Frank Sinatra at the Chicago theater in around 46 I did not even know who he was but the girls were screaming and in the later 50's got to see the big bands at the Aragon Ballroom and Melody Mill.

The band sans Ray McKinley but still with Doc Goldberg on the bass, so this is late 1941?