Interesting. AC/DC's Back In Black album has just been certified for sales of 21 million copies in the US, tying it with Billy Joel's Greatest Hits Vol I &II for 5th on the all time sales list. It kind of makes you wonder, as with many artists in a similar position, why they still tour, as unless they have the most corrupt management in sight they presumably have lots of money. Despite some of the excesses associated with the band they really don't have a rep for doing ridiculous things with their money. Then again you never know. Its hard to imagine how Willie Nelson could end up owing the IRS more than 16 million dollars.