Clustering Last.fm Users

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<!DOCTYPE html>
<meta charset="utf-8">
<style>

.node {
  cursor: pointer;
}

.node:hover {
  stroke: #000;
  stroke-width: 3.6px;
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.node--leaf {
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}

.label {
  font-family: "Maven Pro";
  font-size: 12px;
  text-anchor: middle;
}

.label,
.node--root,
.node--leaf {
  pointer-events: none;
}

</style>
<svg width="500" height="500"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>

var svg = d3.select("svg"),
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var pack = d3.pack()
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d3.json("clustered-users-26-20000-americans.json", function(error, root){
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https://d3js.org/d3.v4.min.js