Washington DC, July 27 -- Billy Joel talked about his differences with Elton John. During the newly released second part of HBO's "Billy Joel: And So It Goes" documentary, Joel revealed how John's public push for him to enter rehab caused a major rift between the two music superstars, according to the New York Post.

"Elton had made a comment that he thought I needed real rehab," he said, adding, "He chalked it up to, 'Oh, he's a drunk.' And that really hurt me."

"I said, wait a minute? Don't you know me better than that?" Joel continued. "And there was bad blood for a little while. There was a dovetailing of things that happened during that time."

After John claimed that he and Joel had "so many cancelled tours" because of "illnesses" ...