An animated SVG streamgraph shows the rise and fall of five music formats—CD, CD Single, Digital, Vinyl, and Streaming—from 1973 to 2019. Built with D3.js `stackOffsetSilhouette`, `area`, and `curveMonotoneX`, the areas fade in sequentially on load. A red dashed line marks the user-selected birthday year, and hovering over a layer highlights it while dimming others. Data is parsed from a semicolon-delimited CSV with European decimal commas.