We had a few criteria when deciding: We only included full-length projects that were commercially released, so no mixtapes or EPs. We took into account the world into which the album was released: Did it break new ground or was it just a different version of a more popular album? We weighed the album’s impact and how it’s endured over time: Did it change the game? Do people still play it? And, of course, since we’re Billboard, we took into account how the albums performed commercially — though ultimately, that was a lesser consideration.
