Now if I can just figure out what an app is.
I did not watch that vidya, but that pictured circular keyboard reminded me that the Circular functions of sin(x) & cos(x) and their inverses sec(x) & csc(x) have some utility in music if one is a mathematically inclined composer.
I also did not watch the following vidya:
Which is illustrative of the Circular functions and shows how they can be constrained mathematically to produce "Standing Waves." I hesitate to speculate that there may be a method of musical composition which might echo this "Standing Wave" interference/co
hearance effect...
