Elizabeth Sprague Coolidge (1864-1953) was an American patron of classical music, composer, and pianist, known for her significant contributions to the promotion and commissioning of chamber music. While she composed a limited number of works, her impact primarily stemmed from her role as a supporter of contemporary composers and music education. Coolidge was particularly influential in the 20th century, founding the Coolidge Foundation in 1932, which provided funding for the performance of new chamber works. She commissioned pieces from notable composers such as Igor Stravinsky, Aaron Copland, and Benjamin Britten, greatly enriching the chamber music repertoire. Her notable works include "Sonata for Violin and Piano" and "String Quartet," but her legacy lies more in her advocacy and promotion of music than in her own compositions. Coolidge also played a key role in establishing the annual Coolidge Chamber Music Festival, fostering an environment for emerging artists. Her efforts helped elevate the status of chamber music in America, ensuring that new works were performed and appreciated, thus leaving a lasting impact on the classical music landscape.