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Queen and Elton John may not finish that far behind Madonna in the final ranking. It will all depend on their albums sales which, with new formulas, m...

Hello Anthony, Thank you very much for all the comments. All great suggestions. No doubt, all those acts will eventully be analysed in full deta...

Hello Zbig, Great to see you here. The purpose was to list only a sample of countries, some of the most representative ones, plus a few others f...