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.

The “Just The Way You Are” singer, 76, recalled an instance in which he was knocked unconscious by his father after putting his own spin on Beethoven’s “Moonlight Sonata” during piano practice as a child. Howard, an accomplished classical pianist in his own right, required that all songs be performed as they were originally written.

Alexa Ray Joel watched the new documentary about her father, 'Billy Joel: And So It Goes,' with mom Christie Brinkley. The film premieres in two parts on July 18 and July 25, on HBO Max.

Directors Susan Lacy and Jessica Levin join Morning Joe to discuss the new two-part HBO documentary film 'Billy Joel: And So It Goes'.

In a new, two-part documentary for HBO, Joel tells his family's Holocaust story, a part of his past he's still trying to piece together.

The original version, released in 1983, was a huge international hit, and starred supermodel Christie Brinkley - who would later become Joel’s second wife and also features in the documentary - in the video.