A donut chart displays the number of songs by language, with nine main categories and all remaining languages aggregated into an "Others" slice. Clicking this slice zooms in to reveal the individual languages within that group. The visualization uses D3.js v6 with `d3.pie` and `d3.arc` to generate SVG paths, a `d3.scaleOrdinal` with the Tableau10 color scheme, and custom tooltips for hover interactions. Data is loaded via `d3.json` from a local file.