An interesting visualization technique that exposes regularities/patterns and repetition in musical compositions.
From the source:
The diagrams in The Shape of Song display musical form as a sequence of translucent arches. Each arch connects two repeated, identical passages of a composition. By using repeated passages as signposts, the diagram illustrates the deep structure of the composition.
Below, Madonna, "Like A Prayer":
Contrasting with, Chopin, "Mazurka in F# Minor":