I have a feeling some of these sales figures are worked by the record labels. Payola is rampant.
I am pretty tight with a person who used to work at Billboard in the 90s. I was told the following a few years ago by this person and will try to remember the details for you as best I can.
This person stated that the reason why Mariah Carey got so many #1 records is because of the way her boyfriend and later husband at the time, the all-powerful head of Columbia Records Tommy Mottola, manipulated the particular number of records distributed by Columbia to stores in a given week. Columbia had a lot of huge artists at that time (Billy Joel, Bruce Springsteen, etc), so the stores wanted to keep supplied of the hottest ones. Mottola would force extra Mariah Carey CDs and singles on those stores in order for them to get what they wanted. A similar campaign was used with radio stations. Stations that played Carey a lot would get preferential treatment for other Columbia artists. So when Billboard tallied up the charts, Carey got incredible results. Billboard knew why, the big store chains knew why, and the stations knew why.
There's no doubt that Carey is very talented. She would have been a star regardless. But she became a mega-star because of Tommy Mottola's chart manipulation. Her sales were hotter than hot when they were together.
Remember the slump that she had for a while? Just by coincidence, it happened after she and Mottola divorced and they were bitterly fighting for a while, and he was hooking up with Thalia, a big South American/Spanish star. Get this -- Mottola and Thalia got married in 2000. This is from Thalia's wiki page: "
In 2001 she was nominated for her record Arrasando and won a Lo Nuestro award in the category of People's Prize, and was the first artist to whom an innovative award from Billboard Awards for Latin Music was given, the "Star Award". On May 5 ā a Mexican National Holiday ā the President of the United States, George W. Bush, invited her to a party organized at the White House, and she interpreted a potpourri of popular Mexican songs with a Mexican mariachi orchestra." Hmmmm....
Glee is a BIG DEAL right now. Getting it #1 again makes a lot of people - TV, movie, radio execs, actors/singers agents - happy. Do you really think it's a complete coincidence that it beat STP by 1,000 CDs so that it got to be #1 again?