I just completed The Formula. The book and DVD unlocked the mystery of arranging/harmonizing to me. It has so much useful information that I can use. I’m blown away.As an experiment, I arranged (what I think is) a really nice version of Happy Birthday. It just plain works!Thanks a billion for making it understandable.Andyp.s. I’ve completed The Jazz Lines and Precision Technique. I’m now starting the Chord Melody Assembly Line (which I probably should have done before The Formula).