depends - isn't an album more important than a single?
Sure. And that's why they use albums as their point of reference. Bowie had 1,005 album weeks as of last June.
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does it matter how much money was made?
Not if we're gaging 'chart success' in a pure sense. But Bowie makes more off an album sold than Elvis or The Beatles or Elton John and that is because he is singular songwriter.
In reply to:
and then of course in a time in which the normal charts get less important there are much more important money sources for artists like downloadcharts, ringtonecharts, etc.
That will become more relevant as time goes on. But it will be some time before Elvis ringtones outsell the last 50 years of albums and singles.