Marshall Tucker band it is, by the looks of it. Found the following lyrics at this place

THIS OL' COWBOY

Well, I'm a-sittin' down in San Antone, waitin' on an eight-o'clock train.
My woman left me here last night; things ain't been quite the same.
I gotta get back to Dallas, and tie up a few loose ends.
I'm gonna work a week, make a hundred dollars, ah, and hit the road again.

CHORUS: So I don't want you to think that you're the first one to leave me out here on my own,
'Cause this ain't gonna be the first time this ol' cowboy's spent the night alone.

Well, honey, I been a fool, but a bigger fool I can't remember when I been,
Just to open up my heart, and let you walk right in,
But there's one thing in life that ain't hard for me to do:
That's as soon as I kiss the lips of another woman, I'm gonna forget all about you.

CHORUS

Lord, If you wrote all the women's names down I know, and let me pick one out,
I don't b'lieve there'd be one in the whole bunch, aw, I'd give a hoot about.

CHORUS