Ozzy Osbourne is desperate to record an album of acoustic ballads but record company bosses won't take him seriously unless he's the Prince of Darkness.

The rocker is keen to show off other aspects of his musical ability, but fears he'll have to keep recording heavy metal tunes until his dying day.

The Black Sabbath leader says, "Trying to get away from the Prince of Darkness is the hardest f**king thing.

"I'd like to sing songs that are mellower. I'd like to do an acoustic album. I don't want to be screaming when I'm 60.

"But all the record company is interested in is my looking like a f**king madman with cherry juice running down my face."