I saw this episode description on IMDB that said the following:

This is the first episode in which Urkel is shown playing his accordion. The episode in question was Rock Video from Season 1 and I would like to know if it's real or not.

Is Jaleel really playing the accordion or no?

I don't know if his playing was real, but I loved when that accordion was in front of him. I love when he played it for his audition at the night club in season seven. He of course had to turn into Stephan in order to score that job.

God bless you always!!!

Holly

I don't know if his playing was real, but I loved when that accordion was in front of him. I love when he played it for his audition at the night club in season seven. He of course had to turn into Stephan in order to score that job.

God bless you always!!!

Holly

Thanks Holly. God bless you also!

I think its all CGI and he's not really playing it at all