Olivier Messiaen
Messiaen’s music is full of different sounds.  He wrote extremely well for large orchestras and for the organ, using different instruments or organ sounds in very original ways, e.g. in Chronochromie (1960) for large orchestra and Méditations sur le mystère de la Sainte Trinité.(1969), a work which uses styles from his earlier period together with birdsong. Messiaen had synesthesia which meant that music often made him think of particular colours.  In his orchestra Messiaen often used an instrument called the ondes Martenot which was a kind of electronic keyboard instrument. His sister-in-law Jeanne Loriod was a famous player of the ondes Martenot.  Messiaen was also influenced by Indonesian gamelan music.  For a short time he experimented with total serialism.