William Sidney Mount (1807-1868) was an American painter from Setauket, New York. Although not the first artist to use this style, Mount was the foremost American genre painter of the 19th century. He produced naturalistic portraits and narrative scenes that documented the daily life of the common man.

Mount began painting as an apprentice at his brother, Henry Mount's (1804-1841) sign shop in 1825, spending his free time drawing and painting primarily portraits. Wanting to learn more, Mount enrolled in drawing classes at the newly established National Academy of Design in New York. In 1830 Mount displayed his first successful genre painting entitled, "Rustic Dance After a Sleigh Ride" at the National Academy exhibition. Within two years of this piece, Mount secured full membership to the National Academy of Design and was quickly hailed a pioneer of American art. Mount lived and worked in Long Island, often depicting the yeomen of the area. Mount was one of the first artists to specialize in the American rural scene. Previously, there was a belief that the American daily life of rural areas was not worth depicting. Mount's refreshing and down-to-earth style contradicted this notion and became widely popular.

Music also played a large role in Mount's life. Mount grew up surrounded by music. He maintained this passion not only through his depictions of music and dance in his paintings, but also as a fiddler, fife player, collector of folk songs, and a violin designer. He designed the "Hollow Back" violin and displayed this instrument in the 1853 New York World’s Fair, Crystal Palace, where the violin received praise by contemporary musicians. The violin was designed in a concave shape and a short sound-post to create a fuller, richer, more powerful tone.

Some of Mount's most prominent works featured music and dance. Mount loved to capture his subjects in spontaneous moments of dancing, farming, fiddling, reading, conversing, or playing. When painting musicians, he would often ask them to play while he was sketching because it "enlivens the subject’s face." Two such examples of this liveliness is "The Banjo Player" (1856) and "The Bone Player" (1856), two of Mount's more famous works. "The Banjo Player" is a portrait of a young Black musician smiling while in the midst of playing a banjo. "The Bone Player" similarly depicts a Black musician playing two sets of bones, an instrument connected with African-American minstrels. Because Mount sought to portray real people from his area, his work is much more inclusive than other artists' of the time. Mount used his art to show Black men in a more sensitive and dignified light. He was the first painter to give Black Americans a prominent, non-stereotypical place in his paintings. This aligned with his egalitarian belief that individuals must be accepted for their own worth.

Mount himself was an interesting figure. Along with his egalitarian beliefs, Mount had an interest in Spiritualism. Spiritualism follows the belief that spirits of the dead exist and can be communicated with. Mount became invested in this belief in the 1850s and even reported that he was able to contact the spirits of his deceased relatives. He wrote his experience in his journal, dubbed "The Spirit Journal."

Mount fell sick after dealing with the affairs of his recently diseased brother Shepard Alonzo Mount (1804-1868). Shepard Alonzo Mount was also a well renowned artist who studied under the National Academy of Design. William Sidney Mount contracted pneumonia and died only a couple months after his brother. Mount never married or had any children. In 1965, his family home, surrounding property, and various outbuildings in Stony Brook, became a National Historic Landmark named the William Sidney Mount House. Mounts artwork can be found in various museums across the country, including the Metropolitan Museum of Art, the Brooklyn Museum of Art, The New-York Historical Society, and the Museum of Fine Arts, Boston. The Long Island Museum of American Art, History, and Carriages owns the largest repository of Mount artwork and archival material