Goofle

I think it calculates your number of individual atrists with the number of plays, and how many are spread between each artist.

So if you have 10,000 artists, but only two or three for each, you would probably have a low score, but if you are like myself, who has around 3,100 and pretty much half of them at least 5+, and around a 1000 with 15+, you get a higher level.

That's what it seems like anyway.

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