He is, quite simply, the most successful pop music artist of all time – and amazingly, Paul McCartney shows no signs of slowing down at 70. Heck, he’d have been famous for his bass playing alone even if he hadn’t written Yesterday: the most-covered song of all time, with over 2000 versions of it. Now flash forward. Having now been a solo artist four times as long as he was a Beatle, McCartney still sells out concerts everywhere he plays and is as beloved a figure as there is in music.