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.

Billy Joel acknowledged “bad blood” between himself and Elton John in the second installment of his two-part HBO documentary “Billy Joel: And So It Goes,” released Friday. Joel explained the pair’s fallout occurred after John publicly insisted he needed to go to rehab.

Billy Joel and Elton John haven’t always seen eye to eye. 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.

Billy Joel opens up about his struggles with alcohol abuse in the new HBO documentary Billy Joel: And So It Goes — and reveals that ex-wife Katie Lee gave him something of an “ultimatum” to either seek help or end their relationship.

Billy Joel has opened up about the moment he realised he couldn’t keep quiet about Donald Trump in his new documentary, Billy Joel: And So It Goes. In the second instalment of the new HBO documentary,

Billy Joel confessed in a new series about his life that he has “never liked getting political onstage.” However, the singer shared one particular Trump moment that inspired him to express his views.

And So It Goes' premieres on Friday, July 25 Billy Joel is reflecting on his unprecedented run at one of the world’s most iconic performance venues. In an exclusive clip shared with PEOPLE from part 2 of the HBO documentary Billy Joel: And So It Goes,