Aristide Cavaillé-Coll (French: [aʁistid kavaje kɔl]; 4 February 1811 – 13 October 1899) was a French organ builder. He has the reputation of being the most distinguished organ builder of the 19th century. He pioneered innovations in the art and science of organ building that permeated throughout the profession and influenced the course of organ building, composing and improvising through the early 20th century. As the author of scientific journal articles about the organ construction details, he published the results of his research and experiments. He was the inventor of the symphonic organ being able to follow smooth and immediate dynamic changes like a symphonic orchestra. This goal was reached by: a) invention of harmonic flue and reed stops, such as the flûte harmonique, trompette ha