I'd like to know the "affinity" of genres.
The question is: How many people listen the "same genres"?
For every genre: which are the genres with most affinity?
Have you tried using the heatmap visualization type for this? It should work just fine. For the x axis use a terms aggregation of genre, for the y axis another terms aggregation of genre, and for the metric use either count or cardinality of user
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