Igor Stravinsky was a Russian composer who lived during the 20th century. He is considered one of the most important composers of the modern era. Stravinsky's compositions span a wide range of styles, from the neoclassical works of his early career to the avant-garde and serialist experiments of his later years. His most famous works include 'The Rite of Spring,' 'The Firebird,' and 'Petrushka.' Stravinsky's innovative approach to rhythm, harmony, and form revolutionized the world of classical music.