Why does J.S. Bach's music deeply resonate in our soul and in our churches like no other one? How can treasures keep hidden in a work that was studied and explored during three centuries?You'll find here the lonely and passionate discovery of marvelous multiple canons structures in many of the famous works of a music history's giant, crowned by surprising revelations, that give some new path of attributing the pieces. The analysis of the historical and cultural context and of some contemporaries' masterpiece let emerge Bach's outstanding earing and compositive talent, explaining his excellence during the organ tournaments. This unveiling is the starting point for a speculative journey using room-acoustics, psycho-acoustics and music performer's practice knowledges to explain why Bach did adopt this compositive strategy, this "secret ingredient" to excel.