Most successful male recording artist

[restless_coder]

I saw a statistic today that Madonna is the most successful (as far as record sales go) female recording artist of all time, according to the Guinness Book of World Records (though some say it's Celine Dion). This led me to wonder: what about the most successful male recording artist?

Obviously, it's the Beatles, but they're not just one guy. So who's next?

Elvis Presley? Michael Jackson? MC Frontalot?

Nope, none of the above.

Go country...