The 69-year-old singer has admitted to being worried about the future direction of the genre, saying young rockers are far too introverted for his liking, reported Contactmusic.
"It concerns me that even the rock bands that are out there are very introverted. The young rock bands don't wanna be outlaws - they don't have any swagger on stage.
"I mean, if I was 18 years old and I'm in a rock band I would wanna show my stuff up there! Young bands seem to be very introverted about that.