A Chuck Berry song. Lyrics on the internet. Also the chorus to a Randy Newman song."Louisiana 1927" by Randy Newman, sung by Aaron Neville.
It has the chorus:
Oh Louisiana, Louisiana,
They're trying to wash us away
Oh Louisiana, Louisiana,
They're trying to wash us away,
Oh Lord they're trying to wash us away
They're trying to wash us away
They're trying to wash us away.
(This chorus may be borrowed from an older song(

First verse of the Berry song:

Oh, Louisiana, I stayed away from you too long
Oh, Louisiana, how can a true love go so wrong?
She put me in shame and in sorrow and I come home tomorrow
Oh, Louisiana.

There is an old Civil War parody to Maryland called Oh, Louisiana; I think there is an arrangement by Roger Abrahams but dunno fer sure.