The singer's ex Katie Lee said Joel always had "a little resentment" toward her for pushing him to seek treatment.

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.

There was a time when seeing Billy Joel and Elton John share a stage felt like magic. Two piano legends, one spotlight, endless hits. But behind the scenes? It wasn’t always harmony. On Friday, July 25,