Charles Tournemire

Charles Tournemire was a French composer and organist, most famous for his improvisations. Tournemire was the youngest student of César Franck, and became the Organist Titulaire at the Basilique Ste-Clotilde, Paris from 1898 to 1939. He was also professor of Chamber Music at the Paris Conservatory, and teacher of organ improvisation.
-Wikipedia, Charles Tournemire