Question Re: Early Episode of Fresh Prince of Bel-Air

I was wondering if anyone knew the song Will played on the piano, when he and his uncle were talking about how they grew up and judging people. Phil talked about how he heard Malcom X speak and judges Will about not being serious. When he walks out of the room, Will continues playing the piano and plays a "well-known" song (I don't know the name but I think it's by Beetoven or Mozart). Phil starts to go toward Will then leaves the room... the episode ends.