We define a certain musical instrument M. The main idea is the organization and function of two basic keyboards described in Section 2. These keyboards permit one to play perfectly all conceivable consonant chords and a hose of dissonant ones. The consonant chords form visible patterns, straight lines. The purpose of M is not to perform any existing music, but hopefully, to inspire a new kind of music.
Mycielski, Jan, "Keyboards for Pure Music ; CU-CS-109-77" (1977). Computer Science Technical Reports. 107.