A hierarchical edge-bundling diagram shows connections between music album credits and contributor roles, arranged radially around a circle. The code uses `d3.cluster` to compute the radial layout and `d3.radialLine` with `d3.curveBundle.beta(0.5)` to draw the bundled paths in SVG. Hovering highlights source and target nodes and links. Data comes from a CSV parsed by `d3.csv`, which is transformed into a hierarchy and import links via custom functions.