Louis Victor Jules Vierne was a French organist and composer. As the organist of Notre-Dame de Paris from 1900 until his death, he focused on organ music, including six organ symphonies and a Messe solennelle for choir and two organs. He toured Europe and the United States as a concert organist. His students included Nadia Boulanger and Maurice Duruflé.

An organist is a musician who plays any type of organ. An organist may play solo organ works, play with an ensemble or orchestra, or accompany one or more singers or instrumental soloists. In addition, an organist may accompany congregational hymn-singing and play liturgical music.