A visual representation of a track's relative intensity. The way I imagine it is as a thin vertical line running down the entire length of the playlist.
When I'm building or reviewing a playlist, I want to know how the songs flow together. For example, If I'm going to play the list when I'm sleeping, I want to see mostly calm blue. If a song might be more intense, and perhaps disturb my sleep, I'd see more red (and remove it from my playlist.)
By "more red" I mean that I'd see shades of purple. I might also be able to change the colors, or use a rainbow default. I might also be able to visualize different aspects, like BPM, key, or range.
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