Here are some other versions of chords that I was sent.

Singing in the Bathtub
By Herb Magidson
From the 1929 movie "Show of Shows" .

Here is a  version provided by Roy Randall of the California Navels (red) ,

F
Why am I delighted
A^b7
Why am I so gay
D^b7
Why am I excited
    G⁷        C⁷    F
Oh, what day is to-day

F
Pardon my elation
A^b7
Everything's all right
D^b7
I get  inspiration
G⁷     C⁷          F      C+
Every  Saturday night, I'm

F       
Singing in the bath-tub
F            D^b7
Happy once a-gain
C⁷
Watching all my troubles
C⁷                    F    E^b7  D^b7  C⁷
Go swinging down the drain

F 
Singing through the soap suds
F               D^b7
Life is full of hope
C⁷
You can sing with feeling
C⁷                    F      Gm  A^b7  A⁷
While feeling for the soap.

Cdim  A               E⁷
Oh A  ring around the bath-tub
G⁷               C  
Isn't so nice to see
A^bdim   A
But a  ring around the bath-tub
A⁷   D⁷   G⁷   G+ C Gm C⁷
Is a rain-bow to me

F
Reaching for a towel
F           D⁷
Ready for a rub
C⁷
Everyone is happy
C⁷                   F
While singing in the tub

Let the Whole wide nation worry over cash
I get compensation in hearing water splash!
Never any troubles cross my bathroom path
Bathing in those bubbles, I'm the knight of the bath

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 is dirt to be abolished
But do not forget one thing
While your body's washed and polished
Sing brother sing!

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

Here is a very similar version fromthe sheet music with the chord changes figured out by my voice teacher, Alison Ledbetter-Hines (blue).

F
Why am I delighted
A^bm⁷
Why am I so gay
D^bm⁷
Why am I excited
    Gm⁷      Cm⁷    F
Oh, what day is to-day

F
Pardon my elation
A^bm⁷
Everything's all right
D^bm⁷
I get  inspiration
G      Cm⁷      F      Cm^7(#5)
Every  Saturday night, I'm

F                    F⁹  F⁷
Singing in the bath-tub
F            D^b7   D^b9 D^b7
Happy once a-gain
C⁷
Watching all my troubles
C⁷                    F    E^b  D^b  C
Go swinging down the drain

F                         F⁹  F⁷
Singing through the soap suds
F               D^b9    D^b7
Life is full of hope
C⁷
You can sing with feeling
C⁷                    F      Gm  A^b(b7)  A^M
While feeling for the soap.

     A^M              E^M
Oh A ring around the bath-tub
em               C
Isn't so nice to see
C     A^M
But a ring around the bath tub
     D^M9  G⁷      C  C⁷
Is a rain-bow to me

F                   F⁹  F⁷
Reaching for a towel
F           D^b7
Ready for a rub
C⁷
Everyone is happy
C⁷                   F
While singing in the tub

Same additional verses.