Omg the struggle it musta been for Billboard to keep data of EVERYTHING before 1991.
No type of computers, and no Soundscan.
Not to mention corruption from some retail music stores, for example a lot of madheads or Janhovas witnesses could have lied if they worked over the counter "Ermagerd lyk True Blue has sold 2000 this week"
Not to mention corruption from some retail music stores, for example a lot of madheads or Janhovas witnesses could have lied if they worked over the counter "Ermagerd lyk True Blue has sold 2000 this week"
And the fact they had to get sales from every retail store in America, and compile them within a few days.