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.

And So It Goes recruits many of the title legend’s musician pals, from Bruce Springsteen and Sting to, surprisingly, Nas, who speaks to the way “Piano Man” still resonates. They all testify to Joel’s songwriting chops,

Almost five hours in length, the two-part look at the hard-to-pin-down artist flows effortlessly, making for a riveting watch even for those coming to it with little affection for his work.

It's no wonder that for their two-part documentary, Billy Joel: And So It Goes (now playing on HBO and HBO Max), the co-directors, 14-time Emmy winner Susan Lacy and two-time winner Jessica Levin, went into the project knowing they had their work cut out for them.

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."

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.

As someone who has seen all the Billy Joel documentaries, I can confidently say that this two-part HBO docuseries is by far the best of the bunch.