A histogram displays the popularity of the top ten songs for a selected music genre, chosen from a dropdown menu. Each bar’s height corresponds to the track’s popularity value on a fixed 0–100 scale. The visualization uses D3 v3 (imported via `d3.scaleBand` and `d3.scaleLinear`) to render SVG rectangles with a transition animation when the genre changes. Data comes from a CSV file, and the genre list includes many categories like pop, rock, and jazz.