"And So It Goes" is not a once-over-lightly, papering-over-the-dark-side portrait of a legendary pop star. It includes the warts, and more than that it shows you how Billy Joel's complicated and not always happy life fueled his exuberant and in some ways deceptively buoyant pop.

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.