Is this number of countries albums went #1 in or most albums that were #1 on the WW year-end charts? If its the former than Garth Brooks has no chance in making this list
'FutureSex/LoveSounds' went #1 in the US, UK, Australia, Canada, Ireland, Singapore, Korea, and Russia (it went diamond there, because he's that global) and that's just off the top of my head.
Wait, so we're including EPs now?
I guess that Justin & Christina EP needs to be included, too.