The article offers information on the role of the liturgical organist of the Grand Orgue, sample based pipe organ simulator. It further discusses about the Gregorian chant, a spiritual and musical source for the Catholic organist; the great joy of assisting at the incomparable Benedictine offices; the relations between the organist and the singing choir, schola or choirmaster; and also mentions that Pius X, demanded that the Christian people pray in beauty.