I haven't been able to find much information on just where this data is coming from. Reading between the lines, it appears to come from music streaming services that have registration requirements.
I only saw one map with any kind of info and it said:
Quote:
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The data for the map is drawn from an aggregation of data across a wide range of music services powered by The Echo Nest and is based on the listening behavior of a quarter million online music listeners.
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