Winnie Lightner’s version from The Show of Shows (1929)

Why am I delighted
Why am I so gay
Why am I excited
Well, what day is today

Pardon my elation
Everything's just right
I get inspiration
Every Saturday night, I'm
   
Singing in the bathtub
Happy once again
Watching all my troubles
Go swimming down the drain

Singing through the soap suds
Life is full of hope - soap
You can sing with feeling
While feeling for the soap.

Oh a ring around the bathtub
Isn't so nice to see
But a ring around the bathtub
Is a rainbow to me

Reaching for a towel
Ready for a rub
Everybody’s happy
While singing in the tub

Oh Saturday’s children, unite to the bath!
This is your judgement day!
Now the ordeal begins, so lift up your chins!
And wash all your sins away!

Singing in the bathtub
Sitting all alone
Tearing out a tonsil
Just like a baritone

Never take a shower
It's an awful pain
Singing in the shower
Is like singing in the rain.

Oh, there’s dirt to be abolished
But don’t forget one thing
That while my body's washed and polished
Sing brother sing!

You can yodel opera
Even while you scrub
Everyone is happy
While singing in the tub.

Repeat last 3 paragraphs