zbicyclist suggests accompaniment and/or a hint via a link to this video:
He notes, “If you watch closely, the lip synch (particularly for the piano playing) has a few misses in it” and that another, actually live performance is better in that regard:
Comics I Don't Understand 
Definitely Arlo. But it didn’t take me a moment.
Would Geezer fit too, since the song dates back to 1957?
There was once a (serious) proposal to license a famous Johnny Cash song for ads for a well-known hemorrhoid cream, but one of the songwriters refused to sign off on the deal.
P.S. Geezer seems appropriate, but the comic is twelve years old. I can’t think of anything that would have made this song “topical”, neither recently, nor when it was originally published.
The song is a timeless classic, and therefore, it’s fair to assume universal familiarity. The near-perfect quotation in the comic holds the hand of anybody who hasn’t heard it recently.
Kilby: Was that an ointment joke, or am I missing your point?
Now I wonder if I’m ever going to hear that Johnny Cash song without thinking of the hemorrhoid cream.
@ Phil – I thought that naming both directly in the comment would spoil the “can you guess it?” effect. You don’t need to read either page to get the joke, just mouse-over the first link, and the address should be sufficient to reveal the painful connection.
@Kilby, the song was used in an ad for spicy food.
JLL was 87 yesterday. I guess with all that drinking, he’s well-preserved. Always loved his music.
I was there in July 1964 when he recorded the live album in Birmingham , AL, Municipal Auditorium. He rocked the house. Yes, JLL jumped on the piano and fully acted out the lyrics as if, Goodness Gracious . . . . . still makes me smile.
Old JLL came to our county fair about 7 or 8 years ago and still put on a good show.
Gasoline Alley has featured an arc with “Sir Terrence Smiles” playing boogie-woogie piano for the past couple weeks (to the general displeasure of the commenters). The character is apparently modeled on a real person, Terry Miles, who likes to play in mall settings in the UK.
Speaking of JLL
https://ew.com/music/jerry-lee-lewis-alive-after-erronerous-report-dead/
@ Mitch – The “erroneous” report has since been updated,Jerry Lee Lewis did in fact die on Friday, Oct. 28th.
Thanks, I just heard this too!