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 directors of "Billy Joel: And So It Goes" recently opened up about the making of the new HBO documentary and provided an update on the legendary singer’s health.

Billy Joel gets a well-deserved marquee documentary treatment with And So It Goes, which streams in two big parts.