SOPP481: What level of harmony I need to follow the course of Prelude Improvisation Formula?
This question was sent by Massimo, and he writes:\n \n\u201cHi Vidas!\nI have a question about prelude improvisation formula.\n1. What level of harmony I need to follow the course?\n2. How many hours a day I need to have a good results?\nThanks\nMassimo\u201d