Billy Joel on stage in 2018Singer-songwriter Billy Joel has opened up about his past falling out with fellow music legend Sir Elton John.In the new documentary Billy Joel: And So It Goes, the Piano Man singer admitted that there was “bad blood” between himself and Sir Elton after an interview the latter gave to Rolling Stone in 2011, opening up about how past joint tours of theirs had to be cancelled due to “illnesses and various other things” including the former’s “alcoholism”.“He’s going to hate me for this, but every time [Billy has] gone to rehab, they’ve been ‘rehab light’,” he claimed. “When I went to rehab, I had to clean the floors. He goes to rehab where they have TVs.“I love you, Billy, and this is tough love. Billy, you have your demons, and you’re not going to get rid of them at ‘rehab light’. You’ve got to be serious. People adore you, they love you a