Billy Joel is a ‘fighter’ in wake of his brain disorder health battle as new doc connects the ‘dots of his life’

Sing us a song, piano man. 

The new documentary “Billy Joel: And So It Goes” covers the life and career of the legendary musician, 76, featuring interviews with Joel, family members, his ex-wife Christie Brinkley, and fellow industry heavyweights such as Bruce Springsteen and Paul McCartney. 

“I asked [Joel] … at the very beginning – if there were any sensitive areas. Not that I would have necessarily stayed away from them, but I wanted to know what they were,” co-director Susan Lacy exclusively told The Post. “And his answer to that was, ‘tell the truth. That’s the only way to go.”

She explained that while probing into the “Vienna” singer’s life, “nothing was off limits.” 

“He didn’t see the film until it was finished, so he stuck by that,” Lacy explained. “And we took that as permission to tell the real story about Billy Joel.”

In fact, the “Uptown Girl” crooner had no editorial control over the film.