When it comes to Billy Joel’s music, it’s still Bach and roll to him. In an exclusive preview clip from the new HBO documentary “Billy Joel: And So It Goes” that aired July 18 on TODAY, the "Piano Man" explains how classical music shaped the songs he has made during his decadeslong career.

Billy Joel is doing much better, the “Piano Man” singer wants fans to know.

“My balance sucks. It’s like being on a boat,” Joel said, later adding, “I feel good. I think they keep referring to what I have as a brain disorder, so it sounds a lot worse than what I’m feeling.”