From "porgy & bess"

Fish got to swim, birds got to fly,
I got to love one man till I die
Can't help lovin' dat man of mine

Tell me he's lazy, tell me he's slow,
Tell me I'm crazy, (maybe I know)
Can't help lovin' dat man of mine

Oh listen sister,
I love my mister man,
And I can't tell you' why
Dere ain't no reason
Why ishould love dat man,
It mus' be sumpin dat de angels done plan

Fish got to swim, birds got to fly,
I got to love one man till I die
Can't help lovin' dat man of mine
Tell me he's lazy, tell me he's slow,
Tell me I'm crazy, (maybe I know)
Can't help lovin' dat man of mine

When he goes away,
Dat's a rainy day,
And when he comes back dat day is fine,
De sun will shine!
He kin come home as late as can be,
Home without him ain't no home to me,
Can't help lovin' dat man of mine

De chimney's smokin'
De roof is leakin' in,
But he don't seem to care
Dere ain't no reason why I should love dat man

And why do you love that man?

It mus' be sumpin' dat de angels done plan

Fish got to swim,
Birds got to fly,
I got to love
One man till I die
Can't help lovin'
Dat man of mine
Tell me he's lazy,
Tell me he's slow,
Tell me I'm crazy,
(maybe I know)
Can't help lovin'
Dat man of mine
When he goes away,
Dat's a rainy day,
And when he comes back
Dat day is fine,
De sun will shine!

Yes, sister
He kin come home
As late as can be,
Home without him
Ain't no home to me,
Can't help lovin'
Dat man of mine