1981 – Pink Floyd’s Dark Side of the Moon…
on February 13th, 1981 at 9:38 am1981 – Pink Floyd’s Dark Side of the Moon becomes the longest-running rock album on the Billboard albums chart. It’s been there for 402 weeks. But it still has a few years to go before it beats Johnny Mathis, whose Greatest Hits was on the chart for a whopping 490 weeks.

