This example visualizes Spotify Premium price increases from 2024 to 2025 by displaying grouped bar charts for four subscription models (Student, Individual, Duo, Family). The dark-themed SVG chart uses D3 v7’s `scaleBand` and `scaleLinear` to position bars, with green bars showing prices before and after the increase. Interactive tooltips appear on mouseover via D3 event handlers, while axis labels, gridlines, and a legend provide context. The React 19 app renders the visualization through `renderBarChart` with the specified data.