Time runs backward in this exploration of why time runs forward, to the tune of Billy Joel's "For The Longest Time"

These are the headlines you Need 2 Know for Friday, Dec. 21, 2018.

The video features different generations of the Piano Man singing the song.

“Turn the Lights Back On” is already a fan favorite. The Piano Man hasn’t released new music for the longest time - 17 years that is - until now.

From Madonna's medical emergency to rebooting old favorites, here is everything happening in entertainment.

From the Piano Man's final bow at MSG to drama off the NBA court, here are your top entertainment headlines.

Normal pressure hydrocephalus is caused by an abnormal buildup of cerebrospinal fluid in the brain.

Famed singer Billy Joel suffered a nasty fall during his performance at the Mohegan Sun Resort in Stamford. He lost his balance and fell on stage, but managed to get up with the help of his band to finish the gig. Despite appearing frail...

Dennis Arfa, Artist Group International Founder breaks down how Taylor Swift's billion dollar "Eras" tour has changed the game. He calls the live space the "golden goose" of recorded music.

Billy Joel at the 2000 Grammy Awards at Staples Center in Los Angeles, California on February 23, 2000. (Footage by WireImage Video/Getty Images)

Alexa Ray Joel and Billy Joel at the Premiere Of 'Last Play At Shea' - 9th Annual Tribeca Film Festival at New York NY. (Footage by WireImage Video/GettyImages)

Alexa Ray Joel and Billy Joel at the Songwriters Hall of Fame 2011 Annual Awards Gala at New York NY. (Footage by WireImage Video/Getty Images Entertainment Video)

INTERVIEW: Billy Joel on why he did not allow the release of his memoir at the Songwriters Hall of Fame 2011 Annual Awards Gala at New York NY. (Footage by WireImage Video/Getty Images Entertainment Video)

Press Conference: Billy Joel on being a roaming ambassador of New York, and being proud to represent the new Rock and Roll Hall of Fame. at the Rock and Roll Hall of Fame Makes A Special Announcement at New York NY. (Footage by WireImage...

Alexa Ray Joel and Billy Joel at the Premiere Of 'Last Play At Shea' - 9th Annual Tribeca Film Festival at New York NY. (Footage by WireImage Video/GettyImages)

Alexa Ray Joel and Billy Joel at the Premiere Of 'Last Play At Shea' - 9th Annual Tribeca Film Festival at New York NY. (Footage by WireImage Video/GettyImages)

Alexa Ray Joel and Billy Joel at the Premiere Of 'Last Play At Shea' - 9th Annual Tribeca Film Festival at New York NY. (Footage by WireImage Video/GettyImages)

Billy Joel at the Songwriters Hall of Fame 2011 Annual Awards Gala at New York NY. (Footage by WireImage Video/Getty Images Entertainment Video)

Alexa Ray Joel and Billy Joel at the Premiere Of 'Last Play At Shea' - 9th Annual Tribeca Film Festival at New York NY. (Footage by WireImage Video/GettyImages)

Alexa Ray Joel and Billy Joel at the Premiere Of 'Last Play At Shea' - 9th Annual Tribeca Film Festival at New York NY. (Footage by WireImage Video/GettyImages)

Billy Joel, Katie Lee Joel at the Cosmopolitan Celebrates its 2008 Fun Fearless Phenom Award Winners at New York NY. (Footage by WireImage Video/GettyImages)

WireImage Entertainment Report: 3/31/09 (Footage by WireImage Video/GettyImages)

DAUGHTER OF BILLY JOEL AND CHRISTIE BRINKLEY IS ENGAGED

Alexa Ray Joel, the daughter of musician Billy Joel and model Christie Brinkley, is getting mar
ried.
She's engaged to...

1. B roll of Billy Joel getting out of a van.

2. B roll of Billy Joel signing stuff for his
fans.
3. B roll off a Billy
Joel i/v.
Billy Joel has checked himself into a substance abuse and psychiatric hospital for a...