Igor Stravinsky was influential in shaping 20th-century music through his innovative compositions that revolutionized classical music. His works, such as "The Firebird," "Petrushka," and "The Rite of Spring," challenged traditional musical norms with their complex rhythms and dissonant harmonies. Stravinsky's ability to fuse various styles, including Russian folk music and neoclassicism, helped redefine the boundaries of music in the modern era. His compositions often inspired other artists, reflecting ongoing societal changes and contributing to movements in both classical and popular music.