This interactive scatterplot maps Spotify track attributes against one another, letting users select any two numeric columns from the dataset to compare on the x- and y-axes. The visualization updates dynamically through D3 v7's `scaleLinear`, `axisBottom`, and `axisLeft` APIs, rendering circles positioned by the chosen metrics. The code assigns CSS classes to each point based on a track genre field, although the dataset’s example rows lack a genre column, so the legend and color-coding rely on that optional data. The SVG plot includes labeled axes and a title reflecting the current variable pair.