Just weeks after the album celebrated it's 40th anniversary, Led Zeppelin's untitled fourth album -- usually known as Led Zeppelin IV -- has re-entered the Billboard Top 200 for the first time since 1987.
This past week, Zeppelin 4 sold just over 3,600 copies to land at No. 166 on the charts.
The album has sold over 23 million copies worldwide since its release 40 years ago this month.
