Joel Whitburn isn't just a legendary pop music researcher — he's also a huge music fan with an underground vault that includes each and every pop single to make it onto Billboard magazine's Hot 100 chart since the chart debuted in 1958. And that's just the tip of the iceberg.

Record Research Inc. website • Opening theme: "Keepers" by Still Flyin' • Closing theme: "Slow Draw/Feeling In My Heart" by Eric Frisch • www.forkeepspodcast.com