This interactive D3 visualization explores a MIDI song by displaying each track's notes as horizontal bars, with x-position indicating start time and bar width representing duration. A color legend for MIDI files lets viewers select which song to examine, while a second legend filters individual tracks. The scatter plot uses `d3.scaleLinear` for axes and `d3.scaleOrdinal` with `d3.interpolateViridis` for note colors, with `transition.duration` and `.delay` animating the bars. Data comes from the Million Song Dataset, rendered as SVG.