Watch the notes rain down on those piano keys. Made with MIDItrail, a MIDI player with a 3-d visualization component. The program (and this video) has been around for a while, but it’s new to me.
Do people still make MIDIs? Before MP3s were a thing I downloaded and played more MIDI files than I care to admit.
Visualize This: The FlowingData Guide to Design, Visualization, and Statistics (2nd Edition)
