The sheet music in pdf format is here. There is some commentary with sound samples here.

IT'S THE BLUEST KIND OF BLUES (MY BABY SINGS)
Words, Spencer Williams. Music, "Nuages" by Jean "Django" Reinhardt. 1946

VERSE: Of all the songs I've ever heard,
I love a blue song. I know ev'ry word.
Night and day I dream in a world of bliss
And so I am confessing the reason is this:

CHORUS 1: It's the bluest kind of blues my baby sings.
It's the newest kind of blues my baby sings.
It's the kind that makes you sigh.
It's the kind that makes you cry,
Doing something to my poor heart like a soft lullaby.

CHORUS 2: It's the bluest kind of blues my baby sings.
It's the truest kind of blues my baby brings,
Always on my mind,
Awake or a-sleeping,
It's the bluest kind of blues my baby sings.

TAG: It's the bluest kind of blues my baby sings.

[Vocals recorded by Monica Lewis, Jessica Molaskey, and Peggy Lee.]