The suck level in Billy Joel's career was simply too much to cram everything in one episode, so Mark and Tyler came back for seconds. Since you people let this guy have somewhere close to a dozen Top 10 pop songs, quite a few of those need to be discussed at length.*
Just like every great sequel, it's everything you loved about the first one... but more! The generation gap gets wider! Billy Joel gets richer and further out of touch! The ripoffs get ripped offer! We finally start the fire!
*The album version of "Piano Man" is nearly six minutes long.