Old albums that still sell well
It's no surprise that the best records by Metallica, AC/DC, Zeppelin, and Guns 'N Roses still sell well today. I bought all of those when I was 15 and the cycle continues. However, what's fun to know is that The Soft Bulletin by The Flaming Lips sold more copies last year than Whitney Houston's debut, Mariah Carey's debut, and Millennium by The Backstreet Boys combined.