Found It! "Mister Herbert Hoover Says that now's the time to buy"

Let's Have Another Cup of Coffee (1932)

Let a smile be your umbrella
For it's just an April show'r
Even John D. Rockefeller
Is looking for the silver lining.

Mister Herbert Hoover
Says that now's the time to buy
So let's have another cup o' coffee
And let's have another piece o' pie!