What makes Mick Jagger's voice strong?

London: Rolling Stones frontman Mick Jagger reveals that the secret behind his strong voice is karaoke sessions.

During the rockers' first ever Twitter question and answer session, the 71-year-old shared: "You have to do warm-ups and look after yourself.

"There's a regiment, you do a warm up before the show and before the tour starts I do a month of rehearsing. So every day I have to do a regiment and after a couple of weeks of that I do karaoke - solo karaoke, but not in a smoke-filled room."

Jagger, who named Jay Z as one of his favourite rappers, revealed that the re-release of their classic album "Sticky Fingers" features a track with Eric Clapton playing Brown Sugar, reports mirror.co.uk.