Alexandre Guilmant
Guilmant wrote eight organ symphonies, as well as a symphony for organ and orchestra, and several shorter works for the same combination. He composed a great many miniatures, not just for organ but also for harmonium. This was useful for musicians in smaller churches which had a harmonium instead of a big organ. He wrote a book on how to play the organ, and for many years he edited collections of organ music which had been written by earlier composers.