ok, i don't know if anyone have suggested this yet, but i've spent a lot of time searching for this song and eliminated peggy lee, diana krall, etc, etc, as candidates...the only one left is the very obscure and unknown:
this is the record company, in the artist album description it says: 'Jazz standards from Gershwin/Porter Berlin with great guitar arrangements and solos by Joe Puma'.
Sounds like it might be, right? but i haven't been able to listen to the song anywhere, and i don't want to risk buying the album by mistake (it's on amazon).
let me know!