Piano Man Billy Joel opened up about falling for his best friend's wife in a new documentary, "Billy Joel: And So It Goes," premiering July 18.

Less than two months after revealing he’s been diagnosed with Normal Pressure Hydrocephalus (NPH), the 75-year-old music legend has resurfaced for a candid conversation with HBO ’s Real Time host Bill Maher. The two caught up at Joel’s home in Florida for an in-depth interview, set to premiere Monday on Maher’s Club Random podcast.

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.

At one point, [Billy] said to me, 'You going deep?' And I said, ‘Yeah, and you know you’re going to go deep too,'" the film’s co-director Susan Lacy says.

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.

I’ve long believed that the first hugely popular music you realize you hate is in many ways as important a discovery as the first music you realize you love. There’s something crucial and formative about the recognition that an artist whose music is beloved by millions makes your skin crawl,

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'.