Hit Parade is back for non-Slate Plus listeners! Upcoming episodes will be split into two parts, released two weeks apart. For the full episode right now, sign up for Slate Plus and you'll also get The Bridge, our Trivia show and bonus deep dive into our subjects. slate.com/hitparadeplus.When Nirvana’s Nevermind ousted Michael Jackson’s Dangerous from the top of the Billboard album chart, it made headlines in early 1992. Only, it didn’t really happen in ’92. What gave Nirvana the win happened right after Christmas ’91. Teenagers who were home for the holidays voted with their gift cards, and they gave Kurt Cobain’s band the win over the King of Pop. This month, Chris Molanphy examines the chart dynamics that not only ushered in the grunge era but also invented a new music sales strategy, the post-Christmas album.Podcast production by Benjamin Frisch.Learn more about your ad choices. Visit megaphone.fm/adchoices