Edgard Varese was a French-born composer who is widely considered to be one of the most influential figures in 20th century music. He is known for his pioneering use of electronic instruments and sound manipulation, as well as his unique approach to musical composition. His works often featured unusual combinations of instruments and sounds, and he was a major proponent of the concept of 'organized sound'. He is best remembered for his compositions such as 'Ionisation' and 'Poème electronique'.