Michael Jackson, Prince, Queen, Kurt Cobain, John Lennon, Whitney Houston... Paul McCartney is probably next in line.
I'm pretty sure that a lot of people other than Paul McCartney have died since your post though.
Lennon died 36 years ago; if famous musicians only die at the rate of every 6 years, that's pretty good. Also, while Prince and the others you mentioned died pretty young, if McCartney dies in 6 years, he'll be 79, which is right around his life expectancy.
But it is interesting that people have been talking about how Prince spent a lot of time developing young musicians in Minnesota while living in seclusion.
That would mean that Prince set himself aside so that low-paid musicians can play more frequently. Well-played, Donald X.
