This is what you get when you cross a histogram and piano keys to show note distribution of songs. It’s the pianogram. View examples such as Fur Elise or the classic Chopsticks, or punch in your own MIDI-formatted song for a taste of the distribution ivories.
Here’s the distribution for Kenny Loggins’ Danger Zone.

Because why not.
Visualize This: The FlowingData Guide to Design, Visualization, and Statistics (2nd Edition)
