"The Impressionists Two-Step" was written by Pop Wagner and sung by him on a performance video called "The Impressionists Two-Step." I can't find any evidence that he recorded it on any other medium. However, his web site has a short sound sample you can listen to.

It is also performed by the David Nelson Band (sort of Grateful Dead-wannabes) on "Keeper of the Key." CDNOW has a sound sample of this. I listened to both samples and pieced together this much of the lyrics. It's done in a sort of Cajun style:

Monet and Manet
Were strollin' down the Elysee
Pickin' out pastels and other kinds o' paint.
Eddie said to Claude
"I got some rouge that is really odd
And some indigo from Cairo that I bet you ain't."
(or "that makes it hard to use restraint")

They continued this intellectual discussion
Over café latté and an English muffin…