cheradan

A little while ago, the "Wizard of Oz" was coming out digitally remastered, etc... During the promo, a song played briefly throughout. It is sung by a jazz/blues lady singer...it went something like this: "mama don't leave me......ALL by myself". Can anyone PLEASE tell me who it is by and what the song title is? It's not in the soundtrack. I've tried looking up just those lyrics, but I never came out successful. This is a real challenge for you blues/jazz lovers out there... Thanks a million!