Olivier Messiaen was a French composer, organist, teacher, and ornithologist whose music is distinguished by his deep devotion to Catholicism, exoticism, and nature. At the age of 11 he entered the Paris Conservatoire, studying organ and improvisation with Marcel Dupré and composition with Paul Dukas. In 1930, he became the principal organist at La Trinité Cathedral in Paris, a post he held for more than 40 years. His distinguished teaching career is marked by appointments in Darmstadt (1950-1953)