Harmonie universelle ("Universal Harmony"; complete title: Harmonie universelle, contenant la théorie et la pratique de la musique) is a work by Marin Mersenne, published in Paris in 1636. It represented the sum of musical knowledge during his lifetime. This was a major work since it represented the most complete description of music theory near the middle of the 17th century in France. It covers all aspects including theoretical, practical, stylistic, organological, mathematical, acoustical, and theological. Source: Wikipedia (en)