If only these tricks were part of my audition package.

I've often thought I was born in the wrong era.  I wanted to be born in the 20s to allow me to be in my 20s in the 40s, so I could be a big band singer.  In my elaborate fantasy, Christian is a trumpeter in the band and we meet and fall in sparkly, lyrical love set to fantastic dance routines in sound stages made up to look like Paris.  However, if being a singer in the 40s would mean competing with the Ross Sisters, I would have been screwed.  I can't compete with that. 

Who are these women and why have most of us never heard of them until now?