 It is also important to mention composer Jean-Philippe Rameau, who passionately adhered to Cartesian thought. In his Treatise on Harmony (1722), he attempted to lay the scientific foundations of music, and codifies many of the ideas that are the basis of our analysis of music to this day (e.g., tonality, major vs. minor keys, principles of composition and accompaniment). For Rameau, harmony is more fundamental to music than melody. Nonetheless, from the Demonstration of the principle of harmony (1750) on, and after the so-called Querelle des bouffons or “Quarrel of Buffoons”, where Rousseau took him to task (in his Letter about French Music 1753, a libel in favor of the Italian opera), Rameau retreated to the certainty that music is the universal “key” to any subject whatsoever, including geometry.