According to the newspaper, Monaco Matin, H.S.H. Prince Albert II attended some soft-rock concert (sorry, but I have no idea who the musicians are; in other words, I’ve never heard of them) in Monte-Carlo on September 11, 2011.
For the finale the sovereign prince jumped on stage and proceeded to play the drums as if he were the late John Bonham from the band, Led Zeppelin “…to the surprise of all the spectators… he shared his talents as a musician.”
Ferosh.
A rare video clip Prince Albert II, in disguise, playing the drums at some gig in the U.S. J/k.
Source and photo courtesy of: Monaco Matin
royalcorrespondent.com 
according to MONACO TODAY, the concert 64th birthday of Monegasque singer and composer Richard Lord. The song he “assisted” with was the Beatles number… ‘When I’m 64.’