Bill Joel says heroin 'scared' him.

The 64-year-old star revealed his past drug use in a new interview with Howard Stern. The candid one-on-one sit down was in front of 150 people in a New York City town hall setting, where Billy discussed his career, family and childhood.

The Piano Man singer's heroin experience was the inspiration behind the song Scandinavian Skies from his 1982 album The Nylon Curtain, with the star admitting the drug 'scared' him.

In addition, Billy revealed that he almost formed a supergroup with fellow chart toppers Sting, Don Henley and 'another guitarist'.

'I liked being in a band,' he told the audience. 'Someday we might put together a silly supergroup.'

Billy also opened up about his daughter Alexa Ray Joel and her performance and recording career, which she launched in 2006.

'She's really good,' he said. 'Everyone thinks dad set it up. she did it on her own.'

The three-hour event aired live on Howard's SiriusXM radio show and included performances of Billy's biggest hits by Tony Bennett, Melissa Etheridge and a duet version of She's Always a Woman with Pink.

Bill is set to perform a monthly residency at Madison Square Garden with his next show on his birthday, May 9.