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When we say “rock music,” of course, we arenʼt talking about term frequency in a corpus of descriptive text, we’re talking about a kind of music. It’s an amorphous, evolving, imprecisely-delineated genre of music, to be sure, but still, if we were talking in person about this idea of rock music, we could straightforwardly clarify: “You know, rock music, man! Guitars, drums”
Rock is the biggest and most central. The least central genre is “skweee,” which most of us hadn’t heard of before this chart, either.
The calculations and machinations with which we build these genres involve layers upon layers upon layers of data-collection and synthesis, and a carefully considered (and mercifully manageable) amount of editorial guidance
We use 10 dimensions internally, and two completely independent measures of genre similarity.
The point of the map, as with genres is not to resolve disputes, but to invite you to explore music.
(A map for exploration.)
We make maps to mark treasure when we think treasure is rare, and then, later, to remember where we’ve been, once we start to realize that there are treasures everywhere. Eventually, these maps become something to do with our hands while we listen.