I think
Paul McCartney and
Ringo Starr are up there, if not the most influential people who are still alive. I don't know who is more influential than those two really, because I think that the influence of The Beatles, the impact that they had on everything at the time, not just music, you know your shoes and clothes and your hair and moustaches, everything, furniture - if The Beatles had never happened then we'd be living in a parallel universe.