A dark-themed pie chart shows the distribution of total monthly Spotify listeners across music genres, with each slice sized by summed listener counts from the SpotifyTopArtists.csv dataset. D3 v7 loads the CSV with `d3.csv`, aggregates genres using `d3.rollup` and `d3.sum`, and renders the chart with `d3.pie` and `d3.arc` generators. Slice labels display genre names and percentages via `tspan` elements, while a side legend built with D3 DOM joins shows each genre's total listeners in millions.