George Gershwin is a celebrated American composer who significantly impacted the evolution of modern music styles, notably through his integration of jazz elements into classical music. His works, such as "Rhapsody in Blue" and "Porgy and Bess," showcase innovative harmonies and rhythms that blurred the lines between genres. Gershwin's unique style not only influenced American music but also contributed to the global appreciation of jazz, making him an essential figure in the music landscape of the 20th century.