Sad but true: This whole "of all time" list is sooo not useful in reflecting the quality of the music.... Artists like Donna Summer, David Bowie or Pet Shop Boys etc etc never sold half the number of singles as compared to Rihanna or Gaga but they're still recognised as better artists than the whole list above....COMBINED!!! Also, Rihanna, start writing your own material... We're actually quite tired how 'your' lyrics are hypersexual all the times...