Directors Susan Lacy and Jessica Levin spoke about their two-part documentary ‘Billy Joel: And So It Goes,’ which premieres Friday on HBO.

Dive into Billy Joel's life with this documentary that features interviews and stories revealing the man behind the music.

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.