Who is widely regarded as the first important composer of American popular song, with over 200 compositions to his credit?

Stephen Collins Foster is recognized as the first important composer of American popular song due to his significant contributions in the 19th century. Foster's work includes beloved songs such as "Oh! Susanna," "Camptown Races," and "Swanee River," which helped to establish a distinctly American musical identity. He is often referred to as the "father of American music" for his ability to capture and blend various musical influences, including African American folk music, into popular formats that resonated with a wide audience. His prolific output of over 200 compositions laid the groundwork for future songwriters and composers in the American popular music tradition, making him a pivotal figure in this genre's history. The richness and emotional resonance of his songs have ensured their longevity, solidifying Foster's legacy in American culture.