record breakers

[tallica]

how many time does an album have to sell to become platnum, im trying to figure out roughly how many albums of thriller michael jackson has sold

[Stephen_G]

How many sales make up Platinum, Gold etc:

http://en.wikipedia.org/wiki/Music_recording_s ales_certification

Thriller itself:

http://en.wikipedia.org/wiki/Thriller_%28album %29

[Whickerman]

bear in mind platinum, gold etc mean a very different amount now than, say, the 80s