Mashups, the art of mixing multiple songs into one continuous song, is a subtle art. When a mashup is done well, you often can't hear all of the different songs merging into one, because it's so fluid. Cameron Adams, aka The Man in Blue, visualizes his own mashup Definitive Daft Punk, to show just what goes into the piece.
You might have seen the similar work from Benjamin Brahn, who showed Girl Talk's mashup album All Day, which sampled from 373 songs. While Adams' mashup is not as massive, the visual component is quite nice. Each circle represents a sample from a song, and going clockwise from the top, you see middle, high, and bass. Then on the bottom is the breakdown by time.
It's all done in HTML5 and CSS3, so you'll need a modern browser to see it in action.
[Anatomy of a Mashup | Thanks, Cameron]