William Walker (1809–1875) was an American hymn writer and composer, best known for his role in shaping Southern gospel music. A significant figure in the 19th-century sacred music movement, Walker compiled and published several hymnals, with his most notable work being "Southern Harmony," first published in 1835. This collection featured shape-note hymn singing, which was a popular method used to teach music in churches and schools. Walker’s work emphasized communal singing and was instrumental in the development of American folk hymns. His arrangements often combined traditional hymns with folk melodies, reflecting the musical styles of the time and region. Notable hymns from "Southern Harmony" include "Amazing Grace" and "The Old Rugged Cross," which have become staples in American religious music. Walker’s impact on music lies in his contribution to the shape-note tradition and his efforts to democratize music-making, making it accessible to a broader audience. His work laid the groundwork for future generations of gospel music and shaped the sound of American church music, influencing both traditional and contemporary Christian genres.