This article kinda explain how to build graphics based on the translation of the music. It will give you the basic and important steps that you can follow to be able to accomplish your task!
Michael Kubovy, DavidVan Valkenburg
This project accesses the Midi Jack library created by Keijiro Takahashi.
Links: https://unitylist.com/p/24e/Unity-Midi-Control, https://github.com/keijiro/MidiJack