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It's probably fair enough to adjust for less reliable record keeping in the 50s and 60s.

Yep... and Taylor top 5 maybe?

I guess that if they are doing this change, they know they can grab some big names from Barcelona that are not attending Porto or Paredes de Coura, like Sabrina or Chappell.    After the Kalorama Madrid disaster (changing the location and announcing the festival too late and then the storm) and low sales in Portugal, I imagine the festival will be in big financial troubles if this year edition fails to sell many tickets.

A quick scan seems to suggest that it would make Drake the biggest selling artist of all time.

I never trust those lists.