In 2021, CD sales increased for the first time in 17 years. That’s mostly because of Adele, whose new album sold 898,000 of those shiny little discs. The last time CDs were this hot, Usher, Ashlee Simpson, and Hoobastank were the ones selling them. Now it’s Adele, BTS, and Taylor Swift. It’s part of an overall revival for physical media — vinyl is booming even bigger. But for those of us who love the humble compact disc, it’s a question worth pondering: Are we finally seeing the CD revival? Why are music fans falling back in love with the gadget that once promised “perfect sound forever”?