Billy Joel had a heavy metal band--Attila--in 1969/70. He was partners in the band with Jon Small. . .until Joel and Small's wife fell in love.
“They released only one album, Attila, in 1970. Attila is often selected by critics and other music journalists as one of the worst rock albums of all time. Joel himself has gone on record as describing the album as “psychedelic bullshit”. - Wikipedia
---o0o---