The Emo Tree visualizes the top 20 artists from a Last.fm listening history, organized by music genre in a hierarchical tree layout. Genre nodes branch into artist leaves, with each artist’s text size and color (via a plasma sequential scale) encoding their total play count. The visualization uses d3.cluster, d3.hierarchy, and d3.linkHorizontal to compute and draw the tree, while d3.zoom enables panning. Data is loaded from a CSV and JSON file, with artists filtered to those exceeding five plays, and all rendering is done as SVG.