Last week Led Zeppelin fans celebrated the band’s iconic fourth album’s 40th birthday. If you dusted off your original vinyl copy and bought a new needle for the occasion, one thing is for certain: you weren't alone. 

Many Led Zeppelin fans also took advantage of special pricing for the album set for the occasion, moving the package into the Billboard 200 for the first time in 25 years.

The album, commonly referred to as IV, the Untitled Fourth Album, or The Zoso Record spent four weeks at No. 2 upon it’s release in 1971, but according to got only as high as No. 166 this time.

That’s a 273 percent sales increase however, most likely the result of being offered at a special digital price of $5.99 through and $6.99 through iTunes.

If you’re interested in learning more about this landmark album you can check out the list of 10 Things You Didn’t Know About Led Zeppelin IV.