Billy Joel is opening up about a tough moment with longtime friend and tourmate Elton John. In the second part of the new two-part HBO Documentary, "Billy Joel: And So It Goes," the "New York State of Mind" singer shared how John's public comments that he needed rehab strained their friendship.

John’s full quote wasn’t exactly subtle. He blamed Joel’s alcoholism for tour cancellations, accused him of “coasting,” and described Joel’s rehab stints as “light,” quipping that when he went to rehab, he had to clean the floors, while Joel had TVs.

Billy Joel documentary gives an in-depth view of his life and career originally appeared on Goldmine.

So It Goes’ will fully prepare you to teach a college class on Joel the angry young man, Ex-Wife Guy, and unlikely superstar.

Billy Joel has a right to his opinions, of course, but many might not like his stance on one legendary Beatles album.