Justdid some checking and it seems that Madonna and Iron Maiden are close but difficult to substantiate because the previous counting methods favor acts who get tracked religiously through big chain sellers. Maiden wasn't sold at these respectable places and the record companies weren't out to see their investments pay off with them because they didn't invest in them as they did with Madonna (or MJ). BUT something called the Novella award in England was given to Maiden in 2002 for reaching 80 million and according to a site called "absolute Madonna" her total sales stand currently at 120-130 million. I'd give the edge here to Maiden and like I said, Madonna or Michael Jackson fans never believe! Now gimme my money!