From the sheet music at Baylor University:


PLAY THAT BARBER SHOP CHORD
Words by Wm. Tracey, music by Lewis F. Muir, ©1910.
"Prominently Featured by Bert Williams"

1. Down in a great big rathskellar,
Where a swell colored fellow
By the name of Bill Jefferson Lord
Played piano while he'd sing a song,
He just sung and played the whole night long,
Till one night, a kinky haired lady
They called Chocolate Sadie
Heard him playing that barber shop chord.
When he finished, Sadie drew a sigh.
Ev'ry time that she would catch his eye, she'd cry:

CHORUS: "Mister Jefferson Lord,
Play that barber shop chord.
That soothing harmony,
It makes an awful, awful, awful hit with me.
Play that strain
Just to please me again,
'Cause, mister, when you start that minor part,
I feel your fingers slipping and a-gripping at my heart.
Oh, Lord, play that barber shop chord."

2. From that night, she never rested.
That same tune she requested
Ev'ry time she went into the place.
Just as soon as she sat down, she roared:
"Play that ever lovin' barber's chord!
Oh! I'm goin' to stick like a plaster
To my new music master,
For I surely go off of my base.
When I listen to that melody,
There's no other music I can see; that's me."