What makes Mick Jagger's voice strong?

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.