On his return from the front, he went back to music and entered the Schola Cantorum de Paris with Maurice Sergent, Vincent d'Indy and especially Louis Vierne as teachers, whose latter's influence would be predominant in his compositions for organ.
[4] For the 1927/1928 musical season, he did not forget the Lyon scene alongside Paul Le Flem, André Caplet and Jacques Ibert by premiering En marge de trois maîtres français.
But Rougier returned to his favourite instrument, the pipe organ and, after an experience as assistant at the Church of Saint-Sulpice and as appointed organist at the Dominicains convent of the rue du Faubourg-Saint-Honoré in Paris[5] he became a titular in several parishes in Lyon such as Saint-Irénée, Saint-Polycarpe and Saint-Pothin.
[6] Titular of the great organ of the Église Saint-Pothin, he invited in particular Marcel Dupré, Pierre Cochereau, Maurice Duruflé, Gaston Litaize, Jeanne Demessieux, Jean Langlais and Marie-Claire Alain to the gallery .
[12] A professor at the Conservatoire de Lyon [fr], where Georges Aloy, Patrice Caire, Maurice Clerc, Paul Coueffë, Georges Guillard, Jean-Pierre Millioud, Jean-Luc Salique, Marcel Godard among others were his students[13] as well as Madeleine Jallifier,[14] Rougier was a tireless promoter of organ music in Lyon, which led him to create the Société des Amis de l'Orgue with Jean Bouvard, Norbert Dufourcq, Marcel Péhu and abbott François Boursier,[15] and to devote research to the electronic combiner and organ building.