RELAXING MUSIC NO FURTHER A MYSTERY

4 time signature, is actually a holdover of the image, not a letter C as an abbreviation for "typical time", as popularly considered). When several of those innovations are ascribed to Vitry, and considerably present in the Ars Nova treatise, it was a contemporary—and private acquaintance—of de Vitry, named Johannes de Muris (or Jehan des Mars)