🕶️ A view of its UI while MIDI music is playing. Notes are represented by colored bars (depending on the type of instrument) descending from the top of the screen, corresponding to the notes played. A bar (retractable when the mouse is no longer hovering over it) at the top of the screen displays the song's progress. 📚️ Neothesia is a (fork of Synthesia, and a) libre, multi-platform, GPU-accelerated MIDI visualizer that can be used as an (elegant) MIDI player or to quickly learn to play the piano. It takes musical notes from a midi file as input and displays them as colored blocks falling onto a virtual piano.