This interactive scatterplot explores correlations among numeric audio features and metadata for Spotify tracks. Users select any two variables from dropdown menus to compare, with the Spearman correlation coefficient calculated from a sampled subset and displayed below the chart. The visualization is built with D3 v5, using `scaleLinear`, `axisLeft`, `axisBottom`, and `selectAll('circle')`, rendering as SVG. Data comes from a CSV of Spotify tracks, with points styled in translucent blue to reveal density.