Billy Joel is opening up about one of the most complicated chapters of his life in his new documentary, "Billy Joel: And So It Goes."

Billy Joel's career is so massive it requires a two-part documentary. Here's a look into the first half, which opened Tribeca Film Festival.

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.

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.

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.