A stylized line chart visualizes the rise and fall of CD and CD Single music sales from 1973 to 2019, aggregating yearly units into a single time series. The React-based visualization uses D3 v5 functions like `scaleLinear`, `extent`, and `max` for axes, while the `Marks` component employs `line` and `curveNatural` to draw smooth paths with circular points. Data is fetched as CSV and filtered by format, leveraging the Poppins font for a clean, modern aesthetic against muted axis colors.