Took a look at the lineup. Great choices.
I have many of the artists on period presses. Ella,Julie and Dusty on mono, and the rest in stereo.
All are definitely "you are there" recordings. No need for "audiophile"(audiophool in my case) pressings.
If curious about more Ella, her version of "Black Coffee" on "Let no man write me Epitaph" is the reference for any singer to follow, along with several other cuts. I believe there is a 45RPM. I don't know if that's the version on your album. It's just Ella and piano.