By virtue of my father’s immense knowledge of jazz, I believe I have an answer myself for the first one; it was done with Helen Forrest, who – according to him – was one of the best singers Harry James used. Further, she was also in Artie Shaw’s band. I did in fact come upon the same version of the song (with his help) on the album 101 – The Ultimate Harry ...
There are multiple listings for that song in Discogs.Com and credit a singer names Kitty Kallen as the vocalist (on all three versions, but you have to look at the image of the disc to find that)
Lovely song, glad you posted the question!