The late 19th and early 20th centuries marked a transformative period in music history. Rapid social, political, and technological changes influenced composers to push boundaries and explore new forms of expression. Major movements like Impressionism, Expressionism, and Neoclassicism emerged, challenging traditional aesthetics. Influential composers such as Debussy, Stravinsky, and Schoenberg revolutionized harmony, rhythm, and form, laying the groundwork for 20th-century music.