From the film musical “CAREFREE,” 1938.
Words and Music by Irving Berlin.
Cover by Sol Immerman.
Copyright ©13 Jun 1938.
The sheet music:
The pre-show cover by Albert W. Barbelle:

Accompaniment by James Pitt-Payne:
Lyrics
Come on and hear the Yam man cry
“Any Yam today?”
The sweet potatoes that he’ll fry
Will be Yam today
The little step that you’ll see him do
With every Yam that he sells to you
Is something that you ought to try
Come and Yam today
Chorus
Come get what I’ve got
It will hit the spot
Get your sweet and hot Yam
Raise your hand and sway
Like you hold a tray
When you’re on your way, Yam
Come on, shake your depression
And let’s have a Yam session
There’s that long note
One, two, three, Yam
Every orchestra in America
Will be doing the Yam
Sung here by Laurence Rubenstein: