John Curwen (1816–1880) was an English musician, educator, and music theorist best known for his significant contributions to choral music and music education. He is most recognized for developing the "Curwen hand signs," a system of hand signals designed to teach musical pitch and improve sight-singing, which became an essential tool in music education. Curwen was a prominent figure in the Victorian choral movement and played a crucial role in promoting and organizing choral societies. His notable works include "The Singing Book," published in the 1860s, which was a widely used music textbook designed for schools and choirs, emphasizing the importance of singing as a foundational musical skill. His impact on music is particularly evident in the field of music education, where his methods continue to influence teaching practices. Curwen's techniques laid the groundwork for modern choral training and helped foster a greater appreciation for choral music in Britain and beyond, ultimately contributing to the development of community singing and amateur choirs during the 19th century.