Pete Seeger was an American folk musician and social activist, born on May 3, 1919. He is best known for popularizing traditional folk songs and for his role in the American folk music revival during the 1950s and 1960s. Seeger played the banjo and guitar, and his music often carried messages of peace, justice, and environmentalism. Throughout his career, Seeger was involved in various social movements, including the civil rights movement and environmental causes. He co-founded the Hudson River Sloop Clearwater, an organization dedicated to environmental advocacy. Seeger's songs, such as "If I Had a Hammer" and "Where Have All the Flowers Gone," remain influential and are still sung today.