A. P. (Alvin) Carter (1891–1960) was an influential American musician, primarily known for his work in the country and folk genres. He was a key figure in the development of the Carter Family, one of the most important groups in early country music. Alongside his wife, Sara Carter, and sister-in-law, Maybelle Carter, the trio helped popularize traditional Appalachian music through their harmonies and innovative guitar playing. Notable works include songs like "Will the Circle Be Unbroken," "Keep on the Sunny Side," and "Wildwood Flower," many of which have become standards in American music. The Carter Family's recordings in the late 1920s and 1930s laid the groundwork for future generations of country artists, influencing the genre's development and popularization. A. P. Carter's contributions were not limited to performance; he was also an adept songwriter and collector of folk music, helping preserve many traditional songs that might have otherwise been forgotten. His legacy is felt in the ongoing popularity of the Carter Family's music and its impact on artists across genres, including folk, country, and rock. His work remains a touchstone for understanding American roots music.