Washington DC, July 12 -- Singer-songwriter and pianist Billy Joel opened up on his life, career and music in the upcoming two-part HBO documentary, 'Billy Joel: And So It Goes', reported People.

"Sometimes it's alien to me, this guy, Billy Joel. I don't know who that is, or what that is," said the 76-year-old musician in the trailer.

He added, "I'm reminded of it when I go for a walk on the street. Oh, right, I'm that guy."

The trailer includes family photos and home videos, along with archival footage of him performing throughout his decades-long career and music videos. And, of course, some of Joel's greatest hits are featured, such as 'Big Shot', 'My Life', 'Uptown Girl', and 'Vienna', reported People.

Joel can speak about his chi...