In 1871 he was appointed to play the organ regularly at la Trinité church in Paris, and this position, organiste titulaire, was one he held for 30 years.

[1] From then on, Guilmant followed a career as a virtuoso; he gave concerts in the United States (the first major French organist to tour that country), and in Canada, as well as in Europe, making especially frequent visits to England.

Others included Augustin Barié, Joseph-Arthur Bernier, Joseph Bonnet, Alexandre Eugène Cellier, Abel Decaux, Gabriel Dupont, Charles Henry Galloway, Philip Hale, Edgar Henrichsen, Édouard Mignan, and Émile Poillot.

Albert Dupré, father of the celebrated Marcel, studied organ with Guilmant for seven years prior to his son's birth.

In Dupré's memoirs, he includes an anecdote where Guilmant visits his mother upon his birth and declares that the child will grow up to be an organist.

Unlike Widor, who produced a great deal of music in all the main genres, Guilmant devoted himself almost entirely to works for his own instrument, the organ.

42, was programmed by Sergei Koussevitzky in the 1930s, but was not heard again until Igor Buketoff revived it for a 1977 live recording with the Butler University Orchestra (note, the composer's name is misspelled "Gilmont" in the source).

For example, the Morceau Symphonique is one of the most frequently performed trombone solos, enjoying longstanding popularity among both professional and advanced student trombonists.