The Jimmy Dean Show: Episode 117

Rowlf the Dog is seen briefly during the opening number, "Sugar Foot Rag."
Jimmy Dean happens upon Rowlf all geared up as a beatnik, playing a swinging tune on the trombone. He says he's been taking lessons from the greatest trombonist of them all, Rubberlips Levine. He flies in from Chicago twice a week without a plane to tutor Rowlf. He's become good enough that he plans to release his own album, but it won't have a hole in it: when folks buy it, they'll just have to take his word for it that it's good. 
Jimmy offers that he can play some jazz on the piano. His demonstration is met with a lackluster response from Rowlf, figuring on his performance as rather square (evidenced by his pantomime to the audience). Rowlf counters that one shouldn't be able to pick out the melody in jazz, so he provides his own interpretation, taking up the keys himself -- a shtick he would later become famous for on The Muppet Show. 
He figures on the two of them heading out to Birdland after the show and riffing with the greats. Jimmy concedes that it's not really his style and convinces Rowlf to stick around. Jimmy says to Rowlf that he wants to play his kind of music, although Rowlf corrects him, stating: "You mean, our kind of music". Rowlf gets out his ukulele and tunes it, doing the common My dog has fleas tuning. Rowlf then croons "My man has fleeeas..." to the point Jimmy (and the audience) burst out of laughter. Rowlf starts singing "You Are My Sunshine", although Jimmy doesn't participate for most of it as he collapses (at one point causing his hand to hit a few notes from the piano). He manages to get back up and sings along: "Please don't take my sunshine away.." They then have a moment with piano and ukulele, until Rowlf goes back to doing a jazzy-note style on his ukulele before Jimmy stops him. Rowlf briefly tunes it again as they go back to singing.
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