Welcome to the new episode of the Billboard.com Pop Shop Podcast, Billboard's weekly audio breakdown of the Billboard charts, hottest music news and year's biggest musical events. Casual pop fans and chart junkies can hear Billboard co-director of charts Keith Caulfield and Billboard.com senior editor Katie Atkinson every Tuesday on the Pop Shop Podcast, which can be streamed on Billboard.com or downloaded in iTunes (click here to listen to the previous episode on Billboard.com).

On our latest show, we welcome special guest Lars Ulrich of Metallica! We spoke to Ulrich about the 25th anniversary of the band’s massive self-titled album (often referred to as The Black Album), which debuted at No. 1 on the Billboard 200 chart dated Aug. 31, 1991. The set reigns as the best-selling album in the United States of the entire Nielsen Music era (1991-present), with a whopping 16.4 million copies sold.

“I think you file that one under 'mind f---,'” says Ulrich. “There's so many inherently bizarre things about that fact, I don't even know where to begin.”

7 Fast Chart Facts About Metallica's 'Black Album,' 25 Years Later

We asked Ulrich about his thoughts on having the top selling album of the last 25 years (see above), a little bit about the making of the epic set, and how he feels about new fans discovering the album in 2016.

Also in the podcast, Keith and Katie count down the top 10 selling albums of the Nielsen era -- along with fun facts about each title. Among the artists in the top 10: a reggae legend, a country diva, a fab rock group and a beloved boy band. Do some of your favorite albums factor into the top 10? Tune in to find out!

Listen above and click here to subscribe/rate the Pop Shop Podcast on iTunes.